1529
1529 is the year of the first Ottoman siege of Vienna.
- Odd
- Composite
Where 1529 fits
Why 1529 is special
It failed partly because heavy rain had forced the abandonment of the siege artillery en route. Weather did as much as defence.
Factors & digit properties
- Divisors (4)
- 1, 11, 139, 1529
- Prime factorisation
- 11 × 139
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 1529
- Binary
- 10111111001
- Octal
- 2771
- Hexadecimal
- 5f9
- Roman numeral
- MDXXIX
- Scientific notation
- 1.529 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Henry VIII's divorce case was heard in 1529 and he was excommunicated in 1533, by which point England had already legislated to stop appeals to Rome.
View 1533 →History
The 1529 siege of Vienna failed in substantial part because the Ottoman heavy guns could not be brought through autumn rains. The second attempt in 1683 also failed, and marks the limit of Ottoman expansion.
DocumentedHistoryGeography: ViennaPeriod: 1529
Common questions
Is 1529 a prime number?
No, 1529 is not prime.
What are the factors of 1529?
The factors of 1529 are 1, 11, 139, 1529.
What is 1529 in Roman numerals?
1529 in Roman numerals is MDXXIX.
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