1431
1431 is the year Joan of Arc was executed.
- Odd
- Composite
Where 1431 fits
Why 1431 is special
She was nineteen, tried by a court with a political interest in the verdict, and convicted on a charge of wearing men's clothing after the original heresy case faltered. A retrial twenty-five years later annulled the conviction entirely.
1431 is part of
Factors & digit properties
- Divisors (8)
- 1, 3, 9, 27, 53, 159, 477, 1431
- Prime factorisation
- 3^3 × 53
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 1431
- Binary
- 10110010111
- Octal
- 2627
- Hexadecimal
- 597
- Roman numeral
- MCDXXXI
- Scientific notation
- 1.431 × 10^3
Other mathematical patterns
- Triangular number
- Deficient number
- Hexagonal number
- Harshad (Niven) number
Related numbers & connections
Agincourt and the execution of Joan of Arc, sixteen years apart in the same war. The Hundred Years' War ran for 116 years, which is the detail its name obscures.
View 1415 →Numbers Around Us
- appears alongside1415
why?
Strength 0.50, confidence "high".
History
Joan of Arc was burned in 1431 after a trial whose judges were aligned with her enemies, convicted on a clothing charge once the heresy case weakened. A papal rehabilitation trial in 1456 annulled the verdict, which is unusual enough to be worth stating alongside the execution.
DocumentedHistoryGeography: FrancePeriod: 1431
Common questions
Is 1431 a prime number?
No, 1431 is not prime.
What are the factors of 1431?
The factors of 1431 are 1, 3, 9, 27, 53, 159, 477, 1431.
What is 1431 in Roman numerals?
1431 in Roman numerals is MCDXXXI.
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