1,000,000,000
A billion is a thousand million.
Where 1,000,000,000 fits
Why 1,000,000,000 is special
It has not always been: British English used 'billion' for a million million until the government formally adopted the American usage in 1974. Older British texts therefore mean something a thousand times larger, which is a genuine hazard when reading historical figures.
1,000,000,000 is part of
Factors & digit properties
- Divisors (100)
- 1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 256, 320, 400, 500, 512, 625, 640, 800, 1000, 1250, 1280, 1600, 2000, 2500, 2560, 3125, 3200, 4000, 5000, 6250, 6400, 8000, 10000, 12500, 12800, 15625, 16000, 20000, 25000, 31250, 32000, 40000, 50000, 62500, 64000, 78125, 80000, 100000, 125000, 156250, 160000, 200000, 250000, 312500, 320000, 390625, 400000, 500000, 625000, 781250, 800000, 1000000, 1250000, 1562500, 1600000, 1953125, 2000000, 2500000, 3125000, 3906250, 4000000, 5000000, 6250000, 7812500, 8000000, 10000000, 12500000, 15625000, 20000000, 25000000, 31250000, 40000000, 50000000, 62500000, 100000000, 125000000, 200000000, 250000000, 500000000, 1000000000
- Prime factorisation
- 2^9 × 5^9
- Digit sum
- 1
- Digital root
- 1
Representations
- Decimal
- 1000000000
- Binary
- 111011100110101100101000000000
- Octal
- 7346545000
- Hexadecimal
- 3b9aca00
- Scientific notation
- 1.000 × 10^9
Other mathematical patterns
- Abundant number
- Happy number
- Powerful number
- Harshad (Niven) number
Finance & economics
British English used 'billion' to mean a million million until the UK government formally adopted the American thousand-million in 1974. Historical British figures therefore mean something a thousand times larger, which is a genuine trap when reading older financial and population sources.
DocumentedFinance & economicsPeriod: before 1974
Common questions
Is 1,000,000,000 a prime number?
No, 1,000,000,000 is not prime.
What are the factors of 1,000,000,000?
The factors of 1,000,000,000 are 1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 256, 320, 400, 500, 512, 625, 640, 800, 1000, 1250, 1280, 1600, 2000, 2500, 2560, 3125, 3200, 4000, 5000, 6250, 6400, 8000, 10000, 12500, 12800, 15625, 16000, 20000, 25000, 31250, 32000, 40000, 50000, 62500, 64000, 78125, 80000, 100000, 125000, 156250, 160000, 200000, 250000, 312500, 320000, 390625, 400000, 500000, 625000, 781250, 800000, 1000000, 1250000, 1562500, 1600000, 1953125, 2000000, 2500000, 3125000, 3906250, 4000000, 5000000, 6250000, 7812500, 8000000, 10000000, 12500000, 15625000, 20000000, 25000000, 31250000, 40000000, 50000000, 62500000, 100000000, 125000000, 200000000, 250000000, 500000000, 1000000000.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026