100
100 is a perfect square (10²) and the base of percentages — the fundamental "whole" in decimal measurement.
Where 100 fits
Why 100 is special
100's significance is almost entirely structural: it defines what a percentage IS (parts per hundred), anchors the Celsius scale (0-100 between freezing and boiling water), and marks the common "century" milestone across ages, anniversaries and cricket scoring.
100 is part of
Factors & digit properties
- Divisors (9)
- 1, 2, 4, 5, 10, 20, 25, 50, 100
- Prime factorisation
- 2^2 × 5^2
- Digit sum
- 1
- Digital root
- 1
Representations
- Decimal
- 100
- Binary
- 1100100
- Octal
- 144
- Hexadecimal
- 64
- Roman numeral
- C
- Scientific notation
- 1.000 × 10^2
Other mathematical patterns
- Abundant number
- Happy number
- Powerful number
- Harshad (Niven) number
Related numbers & connections
10 is a factor of 100 (10 × 10 = 100).
View 10 →Mathematically related
- has factor10
why?
Strength 0.50, confidence "high".
Culture
"Century" is used as a milestone term for 100 across contexts including age, anniversaries, and cricket scoring (a batter reaching 100 runs).
Widely documentedCulture"Century" is used as a milestone term for 100 across contexts including age, anniversaries, and cricket scoring (a batter reaching 100 runs).
Widely documentedCulture
Common questions
Is 100 a prime number?
No, 100 is not prime.
What are the factors of 100?
The factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50, 100.
What is 100 in Roman numerals?
100 in Roman numerals is C.
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