odd, composite, perfect square · 225th positive integer
The number 225
225 is an odd composite number. It is the 225th positive integer.
Quick reference
| Prime factorization | 3 × 3 × 5 × 5 |
| Divisors | 1, 3, 5, 9, 15, 25, 45, 75, 225 |
| Binary | 11100001 |
| Hexadecimal | 0xE1 |
| Roman numeral | CCXXV |
| Digit sum | 9 |
| Properties | odd, composite, perfect square |
Reading 225 in NumGrid context
For 225, 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.
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 225’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 225 a prime number?
No. 225 is composite. Its prime factorization is 3 × 3 × 5 × 5.
What are the factors of 225?
The factors (divisors) of 225 are 1, 3, 5, 9, 15, 25, 45, 75, 225.
What is 225 in binary?
225 in binary is 11100001. In hexadecimal it's E1.
What is 225 as a Roman numeral?
225 in Roman numerals is CCXXV.
What's the digit sum of 225?
Adding the digits of 225: 2 + 2 + 5 = 9.