odd, composite · 123rd positive integer
The number 123
123 is an odd composite number. It is the 123rd positive integer.
Quick reference
| Prime factorization | 3 × 41 |
| Divisors | 1, 3, 41, 123 |
| Binary | 1111011 |
| Hexadecimal | 0x7B |
| Roman numeral | CXXIII |
| Digit sum | 6 |
| Properties | odd, composite |
Reading 123 in NumGrid context
For 123, 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.
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 123 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 123 a prime number?
No. 123 is composite. Its prime factorization is 3 × 41.
What are the factors of 123?
The factors (divisors) of 123 are 1, 3, 41, 123.
What is 123 in binary?
123 in binary is 1111011. In hexadecimal it's 7B.
What is 123 as a Roman numeral?
123 in Roman numerals is CXXIII.
What's the digit sum of 123?
Adding the digits of 123: 1 + 2 + 3 = 6.