odd, prime · 491st positive integer
The number 491
491 is an odd prime number. It is the 491st positive integer.
Quick reference
| Prime factorization | 491 (prime) |
| Divisors | 1, 491 |
| Binary | 111101011 |
| Hexadecimal | 0x1EB |
| Roman numeral | CDXCI |
| Digit sum | 14 |
| Properties | odd, prime |
Reading 491 in NumGrid context
For 491, the underlying data on this page comes from classical number theory plus NumGrid solver-derived puzzle statistics. The breakdown above is the federal record; the paragraphs below add the per-entity context that makes the headline numbers usable for a real decision rather than just a data lookup.
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.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for 491 is typically a peer within positive integers within the NumGrid target pool with similar size, similar exposure, or similar geography — not the national-level summary alone.
Frequently asked
Is 491 a prime number?
Yes. 491 is prime — its only divisors are 1 and itself.
What are the factors of 491?
The factors (divisors) of 491 are 1, 491.
What is 491 in binary?
491 in binary is 111101011. In hexadecimal it's 1EB.
What is 491 as a Roman numeral?
491 in Roman numerals is CDXCI.
What's the digit sum of 491?
Adding the digits of 491: 4 + 9 + 1 = 14.