231431031 has 48 divisors (see below), whose sum is σ = 371987616. Its totient is φ = 137749248.

The previous prime is 231431023. The next prime is 231431033. The reversal of 231431031 is 130134132.

231431031 is a `hidden beast` number, since 231 + 431 + 0 + 3 + 1 = 666.

It is not a de Polignac number, because 231431031 - 2³ = 231431023 is a prime.

It is a super-2 number, since 2×231431031² = 107120644219445922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231430995 and 231431013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231431033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 789721 + ... + 790013.

It is an arithmetic number, because the mean of its divisors is an integer number (7749742).

Almost surely, 2^231431031 is an apocalyptic number.

231431031 is a deficient number, since it is larger than the sum of its proper divisors (140556585).

231431031 is a wasteful number, since it uses less digits than its factorization.

231431031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 231431031 is about 15212.8574239030. The cubic root of 231431031 is about 613.9606398533.

Adding to 231431031 its reverse (130134132), we get a palindrome (361565163).

The spelling of 231431031 in words is "two hundred thirty-one million, four hundred thirty-one thousand, thirty-one".