odd, composite · 309th positive integer
The number 309
309 is an odd composite number. It is the 309th positive integer.
Quick reference
| Prime factorization | 3 × 103 |
| Divisors | 1, 3, 103, 309 |
| Binary | 100110101 |
| Hexadecimal | 0x135 |
| Roman numeral | CCCIX |
| Digit sum | 12 |
| Properties | odd, composite |
Reading 309 in NumGrid context
The 309 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 309 sits in the broader integer properties and number-guessing puzzles distribution and which underlying factors drive the headline numbers.
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 309’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 309 a prime number?
No. 309 is composite. Its prime factorization is 3 × 103.
What are the factors of 309?
The factors (divisors) of 309 are 1, 3, 103, 309.
What is 309 in binary?
309 in binary is 100110101. In hexadecimal it's 135.
What is 309 as a Roman numeral?
309 in Roman numerals is CCCIX.
What's the digit sum of 309?
Adding the digits of 309: 3 + 0 + 9 = 12.