1649
1649 is the year Charles I was executed.
- Odd
- Composite
Where 1649 fits
Why 1649 is special
He was tried by a court whose authority he refused to recognise, on a charge of making war on his own people. No European monarch had been publicly tried and executed by his subjects before, and the precedent alarmed every court on the continent.
Factors & digit properties
- Divisors (4)
- 1, 17, 97, 1649
- Prime factorisation
- 17 × 97
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 1649
- Binary
- 11001110001
- Octal
- 3161
- Hexadecimal
- 671
- Roman numeral
- MDCXLIX
- Scientific notation
- 1.649 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Naseby in 1645 destroyed the royalist army and captured the king's correspondence; Charles I was executed four years later.
View 1645 →Law & regulation
Charles I declined to plead, on the grounds that no court had jurisdiction over a king. The court proceeded anyway and executed him in 1649. The legal theory it invented — that a monarch is answerable to the people — outlived the regime that used it.
DocumentedLaw & regulationGeography: EnglandPeriod: 1649
Common questions
Is 1649 a prime number?
No, 1649 is not prime.
What are the factors of 1649?
The factors of 1649 are 1, 17, 97, 1649.
What is 1649 in Roman numerals?
1649 in Roman numerals is MDCXLIX.
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