### 1,000,000,000 (number)

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****1,000,000,000** (one billion, short scale; one thousand million or milliard, long scale) is the natural number following 999,999,999 and preceding 1,000,000,001.

In scientific notation, it is written as "1 × 10^{9}".

Previously in British English (but not in American English), the word "billion" referred to a million millions (1,000,000,000,000). However, this is no longer the case, and the word has been used unambiguously to mean one thousand million (1,000,000,000) for some time.^{[1]}^{[2]} The alternative term "one thousand million" is rare and is used primarily to ease understanding among non-native speakers of English, as many other languages use words similar to "billion" (e.g. Spanish *billón*) to mean one trillion (1,000,000,000,000 or a million millions).

In the South Asian numbering system, it is known as 100 crore or 1 arab.

The term * milliard* can also be used to refer to 1,000,000,000; though "milliard" is essentially non-existent in post-1997 English, variations on this name often appear in other languages (e.g. Danish

*milliard*, Spanish

*millardo*, French

*milliard*, Italian "miliardo", German

*Milliarde*, Hebrew

*מיליארד*, Finnish

*miljardi*, Slovenian

*milijarda*or Russian

*миллиард*).

The SI prefix giga indicates 1,000,000,000 times the base unit.

See Orders of magnitude (numbers) for larger numbers; and long and short scales.

## Selected 10-digit numbers (1,000,000,000–9,999,999,999)

**1023456789**– smallest pandigital number in base 10.**1026753849**– smallest pandigital square that includes 0.**1073676287**– 15th Carol number.**1073741824**= 2^{30}**1073807359**– 14th Kynea number.**1129760415**– 23rd Motzkin number.**1134903170**– 45th Fibonacci number.**1162261467**= 3^{19}**1220703125**= 5^{13}**1234567890**– pandigital number with the digits in order.**1311738121**– 25th Pell number.**1382958545**– 15th Bell number.**1406818759**– 30th Wedderburn–Etherington number.**1836311903**– 46th Fibonacci number.**1882341361**– The least prime whose reversal is both square (40391^{2}) and triangular (triangular of 57121).**1977326743**= 7^{11}**2147483647**– 8th Mersenne prime and the largest signed 32-bit integer.**2147483648**= 2^{31}**2176782336**= 6^{12}**2214502422**– 6th primary pseudoperfect number.**2357947691**= 11^{9.}**2971215073**– 11th Fibonacci prime (47th Fibonacci number).**3166815962**– 26th Pell number.**3192727797**– 24th Motzkin number.**3323236238**– 31st Wedderburn–Etherington number.**3405691582**– hexadecimal CAFEBABE; used as a placeholder in programming.**3405697037**– hexadecimal CAFED00D; used as a placeholder in programming.**3486784401**= 3^{20}**4294836223**– 16th Carol number.**4294967291**– Largest prime 32-bit unsigned integer.**4294967295**– Maximum 32-bit unsigned integer (hexadecimal FFFFFFFF).**4294967296**= 2^{32}**4294967297**– the first composite Fermat number.**4295098367**– 15th Kynea number.**4807526976**– 48th Fibonacci number.**5784634181**– 13th alternating factorial.**6103515625**= 5^{14}**6210001000**– only self-descriptive number in base 10.**6227020800**= 13!.**6975757441**= 17^{8}**6983776800**– 15th colossally abundant number.**7645370045**– 27th Pell number.**7778742049**– 49th Fibonacci number.**7862958391**– 32nd Wedderburn–Etherington number.**8589869056**– 6th perfect number.**8589934592**= 2^{33}**9043402501**– 25th Motzkin number.**9814072356**– largest square pandigital number, largest pandigital pure power.**9876543210**– largest number without redundant digits.

## Sense of scale

The facts below give a sense of how large 1,000,000,000 (10^{9}) is in the context of time according to current scientific evidence:

- 10
^{9}seconds is 114 days short of 32 calendar years (≈ 31.7 years). - About 10
^{9}minutes ago, the Roman Empire was flourishing and Christianity was emerging. (10^{9}minutes is roughly 1,900 years.) - About 10
^{9}hours ago, modern human beings and their ancestors were living in the Stone Age (more precisely, the Middle Paleolithic). (10^{9}hours is roughly 114,000 years.) - About 10
^{9}days ago,*Australopithecus*, an ape-like creature related to an ancestor of modern humans, roamed the African savannas. (10^{9}days is roughly 2.7 million years.) - About 10
^{9}months ago, dinosaurs walked the Earth during the late Cretaceous. (10^{9}months is roughly 82 million years.) - About 10
^{9}years ago, the first multicellular eukaryotes appeared on Earth. - The universe is currently thought to be about 13.8 × 10
^{9}years old.^{[3]}

In terms of distance:

- 10
^{9}inches is 15,783 miles (25,400 km), more than halfway around the world and thus sufficient to reach any point on the globe from any other point. - 10
^{9}metres (called a gigameter) is almost three times the distance from the Earth to the Moon. - 10
^{9}kilometres is over six times the distance from the Earth to the Sun.

In terms of finance:

- The possession of assets with total value of 10
^{9}United States dollars would place a person among the world's wealthiest individuals. - As visualized in a work by artist Michael Marcovici, this amount of money in stacks of hundred-dollar bills can fit on twelve wrapped pallets.
^{[4]}

In terms of area:

- A billion square inches would be a square about one half mile on a side.
- A piece of finely woven bed sheet cloth that contained a billion holes would measure about 500 square feet (46 m
^{2}), large enough to cover a moderate sized apartment.

In terms of volume:

- There are a billion cubic millimeters in a cubic meter.
- A billion grains of table salt or granulated sugar would occupy a volume of about 2.5 cubic feet (0.071 m
^{3}). - A billion cubic inches would be a volume comparable to a large commercial building slightly larger than a typical supermarket.

In terms of natural landscape; a small mountain, slightly larger than Stone Mountain Georgia, United States, would weigh (have a mass of) a billion tons.

In terms of count:

**A** is a cube; **B** consists of 1000 cubes of type A. **C** consists of 1000 Bs; and **D** 1000 Cs. Thus there are 1 million As in C; and 1,000,000,000 As in D.