odd, composite · 381st positive integer
The number 381
381 is an odd composite number. It is the 381st positive integer.
Quick reference
| Prime factorization | 3 × 127 |
| Divisors | 1, 3, 127, 381 |
| Binary | 101111101 |
| Hexadecimal | 0x17D |
| Roman numeral | CCCLXXXI |
| Digit sum | 12 |
| Properties | odd, composite |
Reading 381 in NumGrid context
381 is one of the data points covered by this site’s integer properties and number-guessing puzzles dataset. The detail above comes directly from classical number theory plus NumGrid solver-derived puzzle statistics; the context that follows situates the headline numbers against the broader distribution across positive integers within the NumGrid target pool.
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 381’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 381 a prime number?
No. 381 is composite. Its prime factorization is 3 × 127.
What are the factors of 381?
The factors (divisors) of 381 are 1, 3, 127, 381.
What is 381 in binary?
381 in binary is 101111101. In hexadecimal it's 17D.
What is 381 as a Roman numeral?
381 in Roman numerals is CCCLXXXI.
What's the digit sum of 381?
Adding the digits of 381: 3 + 8 + 1 = 12.