odd, prime · 509th positive integer
The number 509
509 is an odd prime number. It is the 509th positive integer.
Quick reference
| Prime factorization | 509 (prime) |
| Divisors | 1, 509 |
| Binary | 111111101 |
| Hexadecimal | 0x1FD |
| Roman numeral | DIX |
| Digit sum | 14 |
| Properties | odd, prime |
Reading 509 in NumGrid context
509 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.
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 509 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 509 a prime number?
Yes. 509 is prime — its only divisors are 1 and itself.
What are the factors of 509?
The factors (divisors) of 509 are 1, 509.
What is 509 in binary?
509 in binary is 111111101. In hexadecimal it's 1FD.
What is 509 as a Roman numeral?
509 in Roman numerals is DIX.
What's the digit sum of 509?
Adding the digits of 509: 5 + 0 + 9 = 14.