231156169 has 2 divisors, whose sum is σ = 231156170. Its totient is φ = 231156168.

The previous prime is 231156139. The next prime is 231156173. The reversal of 231156169 is 961651132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149940025 + 81216144 = 12245^2 + 9012^2 .

It is a cyclic number.

It is not a de Polignac number, because 231156169 - 2⁵ = 231156137 is a prime.

It is a super-2 number, since 2×231156169² = 106866348933513122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231156139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115578084 + 115578085.

It is an arithmetic number, because the mean of its divisors is an integer number (115578085).

Almost surely, 2^231156169 is an apocalyptic number.

It is an amenable number.

231156169 is a deficient number, since it is larger than the sum of its proper divisors (1).

231156169 is an equidigital number, since it uses as much as digits as its factorization.

231156169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 231156169 is about 15203.8208684528. The cubic root of 231156169 is about 613.7174841846.

The spelling of 231156169 in words is "two hundred thirty-one million, one hundred fifty-six thousand, one hundred sixty-nine".