1291
1291 is the traditional founding date of the Swiss Confederation.
- Odd
- Prime
Where 1291 fits
Why 1291 is special
Three valley communities swore mutual defence, and the charter survives. Switzerland's national day marks it, though the modern federal state dates from 1848.
1291 is part of
Factors & digit properties
- Divisors (2)
- 1, 1291
- Prime factorisation
- 1291
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 1291
- Binary
- 10100001011
- Octal
- 2413
- Hexadecimal
- 50b
- Roman numeral
- MCCXCI
- Scientific notation
- 1.291 × 10^3
Other mathematical patterns
- Deficient number
- Lucky number (mathematical sieve)
- Twin prime
Related numbers & connections
The Swiss Confederation is dated from a 1291 pact between three valley communities, and the modern federal state from 1848 — five and a half centuries apart.
View 1848 →Other connections
- is associated with1848
why?
Strength 0.50, confidence "high".
History
The 1291 pact between three Alpine communities is Switzerland's founding document and its national day. The federal state as it exists now was created in 1848, five and a half centuries later.
DocumentedHistoryGeography: SwitzerlandPeriod: 1291
Common questions
Is 1291 a prime number?
Yes, 1291 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1291?
The factors of 1291 are 1, 1291.
What is 1291 in Roman numerals?
1291 in Roman numerals is MCCXCI.
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