231040331 has 2 divisors, whose sum is σ = 231040332. Its totient is φ = 231040330.

The previous prime is 231040309. The next prime is 231040339. The reversal of 231040331 is 133040132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231040331 - 2¹⁰ = 231039307 is a prime.

It is a super-2 number, since 2×231040331² = 106759269097179122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231040339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115520165 + 115520166.

It is an arithmetic number, because the mean of its divisors is an integer number (115520166).

Almost surely, 2^231040331 is an apocalyptic number.

231040331 is a deficient number, since it is larger than the sum of its proper divisors (1).

231040331 is an equidigital number, since it uses as much as digits as its factorization.

231040331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231040331 is about 15200.0108881540. The cubic root of 231040331 is about 613.6149507836.

Adding to 231040331 its reverse (133040132), we get a palindrome (364080463).

The spelling of 231040331 in words is "two hundred thirty-one million, forty thousand, three hundred thirty-one".