1187
1187 is the year Saladin retook Jerusalem.
- Odd
- Prime
Where 1187 fits
Why 1187 is special
His terms after the siege — ransom rather than massacre — contrasted sharply with the crusader capture of 1099 and were noted by Christian chroniclers at the time. The recapture triggered the Third Crusade.
1187 is part of
Factors & digit properties
- Divisors (2)
- 1, 1187
- Prime factorisation
- 1187
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 1187
- Binary
- 10010100011
- Octal
- 2243
- Hexadecimal
- 4a3
- Roman numeral
- MCLXXXVII
- Scientific notation
- 1.187 × 10^3
Other mathematical patterns
- Deficient number
- Safe prime
Related numbers & connections
Richard I took Acre in 1191 on the Third Crusade, called after Saladin retook Jerusalem in 1187.
View 1191 →History
Saladin allowed the population of Jerusalem to ransom themselves in 1187 rather than putting it to the sword. European chronicles recorded the contrast with the crusader capture of 1099, which is unusual testimony to come from an opponent.
DocumentedHistoryGeography: JerusalemPeriod: 1187
Common questions
Is 1187 a prime number?
Yes, 1187 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1187?
The factors of 1187 are 1, 1187.
What is 1187 in Roman numerals?
1187 in Roman numerals is MCLXXXVII.
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