1523
1523 is a year in the 16th century. Gustav Vasa was elected king and Sweden left the Kalmar Union (Sweden).
- Odd
- Prime
Where 1523 fits
Why 1523 is special
1523 has a profile because of what happened in it rather than because of any property of the number: Gustav Vasa was elected king and Sweden left the Kalmar Union (Sweden).
1523 is part of
Factors & digit properties
- Divisors (2)
- 1, 1523
- Prime factorisation
- 1523
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 1523
- Scientific notation
- 1.523 × 10^3
Roman numerals
M D X X I I I
Binary
1 0 1 1 1 1 1 0 0 1 1
1 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 1,523
Octal
2 7 6 3
2 × 512 + 7 × 64 + 6 × 8 + 3 × 1 = 1,523
Hexadecimal
5 f 3
5 × 256 + f × 16 + 3 × 1 = 1,523
Read as powers of two: 1,024 + 256 + 128 + 64 + 32 + 16 + 2 + 1 = 1,523.
In historical numeral systems
Egyptian
1 lotus, 5 coils of rope, 2 hobbles, 3 strokes
1 × 1,000 + 5 × 100 + 2 × 10 + 3 × 1 = 1,523. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 5 vertical wedges (sixties place), 2 corner wedges + 3 vertical wedges (units place)
25 × 60 + 23 = 1523. 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
- Safe prime
Related numbers & connections
1523 is a year in the 16th century, in the 1520s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1523, Gustav Vasa was elected king and Sweden left the Kalmar Union (Sweden).
DocumentedHistoryGeography: SwedenPeriod: 1523
Common questions
Is 1523 a prime number?
Yes, 1523 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1523?
The factors of 1523 are 1, 1523.
What is 1523 in Roman numerals?
1523 in Roman numerals is MDXXIII.
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: 15 July 2026