1495
1495 is the year syphilis was first recorded in Europe.
- Odd
- Composite
Where 1495 fits
Why 1495 is special
It appeared among troops besieging Naples and spread across the continent within years. Its origin — whether brought from the Americas or already present — is still debated, and each nation named it after a neighbour.
Same number, different meanings
How 1495 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It appeared among troops besieging Naples and spread across the continent within years. Its origin — whether brought from the Americas or already present — is still debated, and each nation named it after a neighbour.
- History
In 1495, the Italian Wars began with the French invasion, drawing Spain and the empire into a sixty-year struggle (Italy).
- Science
Syphilis appeared in Europe in 1495 and was called the French disease in Italy, the Italian disease in France, the Polish disease in Russia and the Christian disease in Turkey. Its origin is genuinely unresolved.
1495 is part of
Factors & digit properties
- Divisors (8)
- 1, 5, 13, 23, 65, 115, 299, 1495
- Prime factorisation
- 5 × 13 × 23
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 1495
- Scientific notation
- 1.495 × 10^3
Roman numerals
M C D X C V
MCDXCV uses the subtractive pair XC: ten before a hundred — a hundred minus ten.
Binary
1 0 1 1 1 0 1 0 1 1 1
1 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 1,495
Octal
2 7 2 7
2 × 512 + 7 × 64 + 2 × 8 + 7 × 1 = 1,495
Hexadecimal
5 d 7
5 × 256 + d × 16 + 7 × 1 = 1,495
Read as powers of two: 1,024 + 256 + 128 + 64 + 16 + 4 + 2 + 1 = 1,495.
In historical numeral systems
Egyptian
1 lotus, 4 coils of rope, 9 hobbles, 5 strokes
1 × 1,000 + 4 × 100 + 9 × 10 + 5 × 1 = 1,495. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 4 vertical wedges (sixties place), 5 corner wedges + 5 vertical wedges (units place)
24 × 60 + 55 = 1495. 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
- Lucky number (mathematical sieve)
Related numbers & connections
1495 is a year in the 15th century, in the 1490s.
Syphilis was first recorded in Europe in 1495, three years after the first Columbus voyage. Whether it was brought from the Americas or already present is genuinely unresolved.
View 1492 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- is associated with1492
why?
Strength 0.50, confidence "high".
History
In 1495, the Italian Wars began with the French invasion, drawing Spain and the empire into a sixty-year struggle (Italy).
DocumentedHistoryGeography: ItalyPeriod: 1495
Science
Syphilis appeared in Europe in 1495 and was called the French disease in Italy, the Italian disease in France, the Polish disease in Russia and the Christian disease in Turkey. Its origin is genuinely unresolved.
DocumentedScienceGeography: EuropePeriod: 1495
Common questions
Is 1495 a prime number?
No, 1495 is not prime.
What are the factors of 1495?
The factors of 1495 are 1, 5, 13, 23, 65, 115, 299, 1495.
What is 1495 in Roman numerals?
1495 in Roman numerals is MCDXCV. XC is subtractive: ten before a hundred — a hundred minus ten. Written additively it would be MCCCCLXXXXV, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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