2009
2009 is the year the Bitcoin network started.
- Odd
- Composite
Where 2009 fits
Why 2009 is special
The first block contains a headline from that day's Times about bank bailouts, which timestamps it and is widely read as commentary. Its creator's identity remains unknown, which is unusual for a system now holding substantial value.
Factors & digit properties
- Divisors (6)
- 1, 7, 41, 49, 287, 2009
- Prime factorisation
- 7^2 × 41
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 2009
- Binary
- 11111011001
- Octal
- 3731
- Hexadecimal
- 7d9
- Roman numeral
- MMIX
- Scientific notation
- 2.009 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
Bitcoin nodes gossip over port 8333, and the network started in 2009 with a genesis block carrying a newspaper headline about bank bailouts.
View 8333 →Technology & computing
Bitcoin's genesis block carries a Times headline from 3 January 2009 about a second bank bailout. It functions as a timestamp proving the block was not created earlier, and it is read as a statement of intent — the first is verifiable, the second is inference.
DocumentedTechnology & computingPeriod: 2009
Common questions
Is 2009 a prime number?
No, 2009 is not prime.
What are the factors of 2009?
The factors of 2009 are 1, 7, 41, 49, 287, 2009.
What is 2009 in Roman numerals?
2009 in Roman numerals is MMIX.
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