odd, composite · 813th positive integer
The number 813
813 is an odd composite number. It is the 813th positive integer.
Quick reference
| Prime factorization | 3 × 271 |
| Divisors | 1, 3, 271, 813 |
| Binary | 1100101101 |
| Hexadecimal | 0x32D |
| Roman numeral | DCCCXIII |
| Digit sum | 12 |
| Properties | odd, composite |
Reading 813 in NumGrid context
For 813, 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.
The methodology behind every numeric value on this page is publicly documented on the classical number theory plus NumGrid solver-derived puzzle statistics portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for 813’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 813 a prime number?
No. 813 is composite. Its prime factorization is 3 × 271.
What are the factors of 813?
The factors (divisors) of 813 are 1, 3, 271, 813.
What is 813 in binary?
813 in binary is 1100101101. In hexadecimal it's 32D.
What is 813 as a Roman numeral?
813 in Roman numerals is DCCCXIII.
What's the digit sum of 813?
Adding the digits of 813: 8 + 1 + 3 = 12.