odd, prime · 61st positive integer
The number 61
61 is an odd prime number. It is the 61st positive integer.
Quick reference
| Prime factorization | 61 (prime) |
| Divisors | 1, 61 |
| Binary | 111101 |
| Hexadecimal | 0x3D |
| Roman numeral | LXI |
| Digit sum | 7 |
| Properties | odd, prime |
Reading 61 in NumGrid context
61 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.
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 61’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 61 a prime number?
Yes. 61 is prime — its only divisors are 1 and itself.
What are the factors of 61?
The factors (divisors) of 61 are 1, 61.
What is 61 in binary?
61 in binary is 111101. In hexadecimal it's 3D.
What is 61 as a Roman numeral?
61 in Roman numerals is LXI.
What's the digit sum of 61?
Adding the digits of 61: 6 + 1 = 7.