odd, composite · 255th positive integer
The number 255
255 is an odd composite number. It is the 255th positive integer.
Quick reference
| Prime factorization | 3 × 5 × 17 |
| Divisors | 1, 3, 5, 15, 17, 51, 85, 255 |
| Binary | 11111111 |
| Hexadecimal | 0xFF |
| Roman numeral | CCLV |
| Digit sum | 12 |
| Properties | odd, composite |
Reading 255 in NumGrid context
The 255 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 255 sits in the broader integer properties and number-guessing puzzles distribution and which underlying factors drive the headline numbers.
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 255’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 255 a prime number?
No. 255 is composite. Its prime factorization is 3 × 5 × 17.
What are the factors of 255?
The factors (divisors) of 255 are 1, 3, 5, 15, 17, 51, 85, 255.
What is 255 in binary?
255 in binary is 11111111. In hexadecimal it's FF.
What is 255 as a Roman numeral?
255 in Roman numerals is CCLV.
What's the digit sum of 255?
Adding the digits of 255: 2 + 5 + 5 = 12.