1625
1625 is the year Grotius published On the Law of War and Peace.
- Odd
- Composite
Where 1625 fits
Why 1625 is special
It argued that relations between states are governed by law derived from reason, binding even without a shared religion or ruler. Modern international law is generally traced to it.
Same number, different meanings
How 1625 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It argued that relations between states are governed by law derived from reason, binding even without a shared religion or ruler. Modern international law is generally traced to it.
- History
In 1625, Hugo Grotius published On the Law of War and Peace, a foundation of modern international law (Low Countries).
- Law & regulation
Grotius argued that obligations between sovereigns could be derived from reason rather than from a shared faith or superior authority. Writing during the Thirty Years' War, that was a proposal about how the fighting might be limited.
1625 is part of
Factors & digit properties
- Divisors (8)
- 1, 5, 13, 25, 65, 125, 325, 1625
- Prime factorisation
- 5^3 × 13
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 1625
- Scientific notation
- 1.625 × 10^3
Roman numerals
M D C X X V
Binary
1 1 0 0 1 0 1 1 0 0 1
1 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,625
Octal
3 1 3 1
3 × 512 + 1 × 64 + 3 × 8 + 1 × 1 = 1,625
Hexadecimal
6 5 9
6 × 256 + 5 × 16 + 9 × 1 = 1,625
Read as powers of two: 1,024 + 512 + 64 + 16 + 8 + 1 = 1,625.
In historical numeral systems
Egyptian
1 lotus, 6 coils of rope, 2 hobbles, 5 strokes
1 × 1,000 + 6 × 100 + 2 × 10 + 5 × 1 = 1,625. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 7 vertical wedges (sixties place), 5 vertical wedges (units place)
27 × 60 + 5 = 1625. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
Related numbers & connections
1625 is a year in the 17th century, in the 1620s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1625, Hugo Grotius published On the Law of War and Peace, a foundation of modern international law (Low Countries).
DocumentedHistoryGeography: Low CountriesPeriod: 1625
Law & regulation
Grotius argued that obligations between sovereigns could be derived from reason rather than from a shared faith or superior authority. Writing during the Thirty Years' War, that was a proposal about how the fighting might be limited.
DocumentedLaw & regulationGeography: NetherlandsPeriod: 1625
Common questions
Is 1625 a prime number?
No, 1625 is not prime.
What are the factors of 1625?
The factors of 1625 are 1, 5, 13, 25, 65, 125, 325, 1625.
What is 1625 in Roman numerals?
1625 in Roman numerals is MDCXXV.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026