231040031 has 2 divisors, whose sum is σ = 231040032. Its totient is φ = 231040030.

The previous prime is 231040027. The next prime is 231040039. The reversal of 231040031 is 130040132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231040031 - 2² = 231040027 is a prime.

It is a super-2 number, since 2×231040031² = 106758991848961922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231039988 and 231040015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231040039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115520015 + 115520016.

It is an arithmetic number, because the mean of its divisors is an integer number (115520016).

Almost surely, 2^231040031 is an apocalyptic number.

231040031 is a deficient number, since it is larger than the sum of its proper divisors (1).

231040031 is an equidigital number, since it uses as much as digits as its factorization.

231040031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 231040031 is about 15200.0010197368. The cubic root of 231040031 is about 613.6146851957.

Adding to 231040031 its reverse (130040132), we get a palindrome (361080163).

The spelling of 231040031 in words is "two hundred thirty-one million, forty thousand, thirty-one".