1481
1481 is the year the Spanish Inquisition held its first auto-da-fé.
- Odd
- Prime
Where 1481 fits
Why 1481 is special
Six people were burned in Seville. The Inquisition operated as an instrument of the Spanish crown rather than the papacy, which is the detail that distinguishes it from the medieval institution.
Same number, different meanings
How 1481 is understood across different contexts — never implying one meaning because of another.
- Mathematics
Six people were burned in Seville. The Inquisition operated as an instrument of the Spanish crown rather than the papacy, which is the detail that distinguishes it from the medieval institution.
- History
In 1481, Otranto was recovered a year after an Ottoman landing on the Italian mainland (Italy).
- Law & regulation
The Spanish Inquisition answered to the crown, not to Rome, and popes repeatedly failed to restrain it. That control is what made it an instrument of state policy.
1481 is part of
Factors & digit properties
- Divisors (2)
- 1, 1481
- Prime factorisation
- 1481
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 1481
- Scientific notation
- 1.481 × 10^3
Roman numerals
M C D L X X X I
MCDLXXXI uses the subtractive pair CD: a hundred before five hundred — five hundred minus a hundred.
Binary
1 0 1 1 1 0 0 1 0 0 1
1 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,481
Octal
2 7 1 1
2 × 512 + 7 × 64 + 1 × 8 + 1 × 1 = 1,481
Hexadecimal
5 c 9
5 × 256 + c × 16 + 9 × 1 = 1,481
Read as powers of two: 1,024 + 256 + 128 + 64 + 8 + 1 = 1,481.
In historical numeral systems
Egyptian
1 lotus, 4 coils of rope, 8 hobbles, 1 stroke
1 × 1,000 + 4 × 100 + 8 × 10 + 1 × 1 = 1,481. 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), 4 corner wedges + 1 vertical wedge (units place)
24 × 60 + 41 = 1481. 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
- Happy number
- Sophie Germain prime
- Twin prime
Related numbers & connections
1481 is a year in the 15th century, in the 1480s.
The papal Inquisition of 1231 introduced rules of evidence where lynching had prevailed; the Spanish Inquisition from 1481 answered to the crown rather than to Rome, which is what made it an instrument of state.
View 1231 →History
In 1481, Otranto was recovered a year after an Ottoman landing on the Italian mainland (Italy).
DocumentedHistoryGeography: ItalyPeriod: 1481
Law & regulation
The Spanish Inquisition answered to the crown, not to Rome, and popes repeatedly failed to restrain it. That control is what made it an instrument of state policy.
DocumentedLaw & regulationGeography: SpainPeriod: 1481
Common questions
Is 1481 a prime number?
Yes, 1481 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1481?
The factors of 1481 are 1, 1481.
What is 1481 in Roman numerals?
1481 in Roman numerals is MCDLXXXI. CD is subtractive: a hundred before five hundred — five hundred minus a hundred. Written additively it would be MCCCCLXXXI, 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