1000000000 (number)

One thousand million (1,000,000,000) is the natural number following 999,999,999 and preceding 1,000,000,001.

In (modern, common) English language usage, it is usually called a billion. (Though in many other languages, a billion means a million millions (or 1,000,000,000,000), instead of the English thousand million.)A milliard can also be used to refer to 1,000,000,000, though this terminology is rarely used in the English language, but often in other languages.

In scientific notation, it is written as 10⁹. Physical quantities can be expressed using the SI prefix giga.

See Orders of magnitude (numbers) for larger numbers.

Selected 10-digit numbers (1000000001 - 9999999999)

• 1023456789 - smallest pandigital number
• 1073676287 - Carol number
• 1073741824 = 2^30
• 1073807359 - Kynea number
• 1111111111 - repunit
• 1129760415 - Motzkin number
• 1134903170 - Fibonacci number
• 1162261467 = 3^19
• 1220703125 = 5^12
• 1234567890 - pandigital number with the digits in order
• 1311738121 - Pell number
• 1382958545 - Bell number
• 1406818759 - Wedderburn-Etherington number
• 1836311903 - Fibonacci number
• 1977326743 = 7^11
• 2147483647 - Mersenne prime
• 2147483648 = 2^31
• 2214502422 - primary pseudoperfect number
• 2222222222 - repdigit
• 2357947691 = 11^9
• 2971215073 - Fibonacci prime
• 3166815962 - Pell number
• 3192727797 - Motzkin number
• 3323236238 - Wedderburn-Etherington number
• 3333333333 - repdigit
• 3486784401 = 3^20
• 4294836223 - Carol number
• 4294967296 = 2^32
• 4295098367 - Kynea number
• 4444444444 - repdigit
• 4807526976 - Fibonacci number
• 5555555555 - repdigit
• 5784634181 - alternating factorial
• 6210001000 - the only self-descriptive number in base 10
• 6227020800 = 13!
• 6666666666 - repdigit
• 6983776800 - colossally abundant number
• 7645370045 - Pell number
• 7777777777 - repdigit
• 7778742049 - Fibonacci number
• 7862958391 - Wedderburn-Etherington number
• 8589934592 = 2^33
• 8888888888 - repdigit
• 9043402501 - Motzkin number
• 9814072356 - largest square pandigital number, largest pandigital pure power
• 9876543210 - largest pandigital number without redundant digits
• 9999999999 - repdigit

Sense of scale

The facts below give a sense of how large one billion (one thousand million, 10⁹) is in the context of passage of time.

• About a billion minutes ago, the Roman Empire was flourishing. (One billion minutes is roughly 1,900 years.)
• About a billion hours ago, modern human beings and their ancestors were living in the Stone Age (more precisely, the Middle Paleolithic). (One billion hours is roughly 114,000 years.)
• About a billion days ago, Australopithecus, an ape-like creature related to an ancestor of modern humans, roamed the African savannas. (One billion days is roughly 2.7 million years.)
• About a billion months ago, dinosaurs walked the earth during the late Cretaceous. (One billion months is roughly 82 million years.)
• About a billion years ago, the first multicellular organisms appeared on Earth. (The universe is now thought to be about 13.7 billion years old.)

In terms of distance:

• A billion centimeters is about the distance from Chicago, Illinois, USA to Tokyo, Japan.
• A billion inches is 15,783 miles, more than halfway around the world and sufficient to reach any point on the globe from any other point.
• A billion meters is almost three times the distance from the Earth to the Moon.
• A billion kilometers is over six times the distance from the Earth to the Sun.

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 billion As in D. Likewise, there are a billion cubic millimeters in a cubic meter.

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