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.
Reading 100 in NumGrid context
100 is one of the data points covered by this site’s integer properties and number-guessing puzzles dataset. The detail above comes directly from classical number theory plus NumGrid solver-derived puzzle statistics; the context that follows situates the headline numbers against the broader distribution across positive integers within the NumGrid target pool.
Every number on this page links back to classical number theory plus NumGrid solver-derived puzzle statistics; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for 100’s peers within positive integers within the NumGrid target pool. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
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.