Factors / Factors of 181

Factors of 181

1, 181

181 is prime: only factor pair is (1, 181), confirmed by trial division up to √181 ≈ 13.5 turning up nothing else. 181's full pair list is (1, 181), for 2 divisors in total. 181's divisors other than 181 itself sum to just 1, 180 below 181: the common deficient case. 181 is odd, digit sum 10 for 181; none of 2-12 divide 181 evenly. 181 has 2 divisors; 180 has 18 and 182 has 8, so 180 wins here. 181 divided by its largest divisor, 1, gives 181.