231251231 has 2 divisors, whose sum is σ = 231251232. Its totient is φ = 231251230.

The previous prime is 231251219. The next prime is 231251257. The reversal of 231251231 is 132152132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231251231 - 2²⁶ = 164142367 is a prime.

It is a super-2 number, since 2×231251231² = 106954263678030722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231256231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115625615 + 115625616.

It is an arithmetic number, because the mean of its divisors is an integer number (115625616).

Almost surely, 2^231251231 is an apocalyptic number.

231251231 is a deficient number, since it is larger than the sum of its proper divisors (1).

231251231 is an equidigital number, since it uses as much as digits as its factorization.

231251231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 231251231 is about 15206.9468007224. The cubic root of 231251231 is about 613.8016022306.

Subtracting from 231251231 its reverse (132152132), we obtain a palindrome (99099099).

The spelling of 231251231 in words is "two hundred thirty-one million, two hundred fifty-one thousand, two hundred thirty-one".