even, composite, perfect square · 100th positive integer
The number 100
100 is an even composite number. It's known as a century; the perfect square of 10. It is the 100th positive integer.
Quick reference
| Prime factorization | 2 × 2 × 5 × 5 |
| Divisors | 1, 2, 4, 5, 10, 20, 25, 50, 100 |
| Binary | 1100100 |
| Hexadecimal | 0x64 |
| Roman numeral | C |
| Digit sum | 1 |
| Properties | even, composite, perfect square |
Why 100 is notable
A century; the perfect square of 10.
Frequently asked
Is 100 a prime number?
No. 100 is composite. Its prime factorization is 2 × 2 × 5 × 5.
What are the factors of 100?
The factors (divisors) of 100 are 1, 2, 4, 5, 10, 20, 25, 50, 100.
What is 100 in binary?
100 in binary is 1100100. In hexadecimal it's 64.
What is 100 as a Roman numeral?
100 in Roman numerals is C.
What's the digit sum of 100?
Adding the digits of 100: 1 + 0 + 0 = 1.