odd, composite · 145th positive integer
The number 145
145 is an odd composite number. It is the 145th positive integer.
Quick reference
| Prime factorization | 5 × 29 |
| Divisors | 1, 5, 29, 145 |
| Binary | 10010001 |
| Hexadecimal | 0x91 |
| Roman numeral | CXLV |
| Digit sum | 10 |
| Properties | odd, composite |
Reading 145 in NumGrid context
The 145 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 145 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 145’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 145 a prime number?
No. 145 is composite. Its prime factorization is 5 × 29.
What are the factors of 145?
The factors (divisors) of 145 are 1, 5, 29, 145.
What is 145 in binary?
145 in binary is 10010001. In hexadecimal it's 91.
What is 145 as a Roman numeral?
145 in Roman numerals is CXLV.
What's the digit sum of 145?
Adding the digits of 145: 1 + 4 + 5 = 10.