odd, composite · 155th positive integer
The number 155
155 is an odd composite number. It is the 155th positive integer.
Quick reference
| Prime factorization | 5 × 31 |
| Divisors | 1, 5, 31, 155 |
| Binary | 10011011 |
| Hexadecimal | 0x9B |
| Roman numeral | CLV |
| Digit sum | 11 |
| Properties | odd, composite |
Reading 155 in NumGrid context
For 155, 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 155 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 155 a prime number?
No. 155 is composite. Its prime factorization is 5 × 31.
What are the factors of 155?
The factors (divisors) of 155 are 1, 5, 31, 155.
What is 155 in binary?
155 in binary is 10011011. In hexadecimal it's 9B.
What is 155 as a Roman numeral?
155 in Roman numerals is CLV.
What's the digit sum of 155?
Adding the digits of 155: 1 + 5 + 5 = 11.