odd, prime · 331st positive integer
The number 331
331 is an odd prime number. It is the 331st positive integer.
Quick reference
| Prime factorization | 331 (prime) |
| Divisors | 1, 331 |
| Binary | 101001011 |
| Hexadecimal | 0x14B |
| Roman numeral | CCCXXXI |
| Digit sum | 7 |
| Properties | odd, prime |
Reading 331 in NumGrid context
The 331 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 331 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 331’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 331 a prime number?
Yes. 331 is prime — its only divisors are 1 and itself.
What are the factors of 331?
The factors (divisors) of 331 are 1, 331.
What is 331 in binary?
331 in binary is 101001011. In hexadecimal it's 14B.
What is 331 as a Roman numeral?
331 in Roman numerals is CCCXXXI.
What's the digit sum of 331?
Adding the digits of 331: 3 + 3 + 1 = 7.