odd, composite, triangular, palindrome · 171st positive integer
The number 171
171 is an odd composite number. It is the 171st positive integer.
Quick reference
| Prime factorization | 3 × 3 × 19 |
| Divisors | 1, 3, 9, 19, 57, 171 |
| Binary | 10101011 |
| Hexadecimal | 0xAB |
| Roman numeral | CLXXI |
| Digit sum | 9 |
| Properties | odd, composite, triangular, palindrome |
Reading 171 in NumGrid context
The 171 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 171 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 171’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 171 a prime number?
No. 171 is composite. Its prime factorization is 3 × 3 × 19.
What are the factors of 171?
The factors (divisors) of 171 are 1, 3, 9, 19, 57, 171.
What is 171 in binary?
171 in binary is 10101011. In hexadecimal it's AB.
What is 171 as a Roman numeral?
171 in Roman numerals is CLXXI.
What's the digit sum of 171?
Adding the digits of 171: 1 + 7 + 1 = 9.