1917
1917 is the year of the Russian Revolution.
- Odd
- Composite
Where 1917 fits
Why 1917 is special
There were two: a February revolution that removed the Tsar and installed a provisional government, and an October one that replaced it with Bolshevik rule. Both are dated by the old Russian calendar, which is why the October revolution is commemorated in November.
Factors & digit properties
- Divisors (8)
- 1, 3, 9, 27, 71, 213, 639, 1917
- Prime factorisation
- 3^3 × 71
- Digit sum
- 18
- Digital root
- 9
Representations
- Decimal
- 1917
- Binary
- 11101111101
- Octal
- 3575
- Hexadecimal
- 77d
- Roman numeral
- MCMXVII
- Scientific notation
- 1.917 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
The Romanov dynasty began in 1613 and ended with the revolution of 1917, having ruled Russia for 304 years.
View 1613 →History
February removed the Tsar and installed a provisional government; October replaced it with Bolshevik rule. Both are named for the old Russian calendar, which is why the October Revolution is commemorated in November.
DocumentedHistoryGeography: RussiaPeriod: 1917
Common questions
Is 1917 a prime number?
No, 1917 is not prime.
What are the factors of 1917?
The factors of 1917 are 1, 3, 9, 27, 71, 213, 639, 1917.
What is 1917 in Roman numerals?
1917 in Roman numerals is MCMXVII.
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