odd, prime, palindrome · 131st positive integer
The number 131
131 is an odd prime number. It is the 131st positive integer.
Quick reference
| Prime factorization | 131 (prime) |
| Divisors | 1, 131 |
| Binary | 10000011 |
| Hexadecimal | 0x83 |
| Roman numeral | CXXXI |
| Digit sum | 5 |
| Properties | odd, prime, palindrome |
Reading 131 in NumGrid context
The 131 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 131 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 131’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 131 a prime number?
Yes. 131 is prime — its only divisors are 1 and itself.
What are the factors of 131?
The factors (divisors) of 131 are 1, 131.
What is 131 in binary?
131 in binary is 10000011. In hexadecimal it's 83.
What is 131 as a Roman numeral?
131 in Roman numerals is CXXXI.
What's the digit sum of 131?
Adding the digits of 131: 1 + 3 + 1 = 5.