231431087 has 2 divisors, whose sum is σ = 231431088. Its totient is φ = 231431086.

The previous prime is 231431063. The next prime is 231431111. The reversal of 231431087 is 780134132.

It is a balanced prime because it is at equal distance from previous prime (231431063) and next prime (231431111).

It is a cyclic number.

It is not a de Polignac number, because 231431087 - 2⁶ = 231431023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231436087) 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 as a sum of consecutive naturals, namely, 115715543 + 115715544.

It is an arithmetic number, because the mean of its divisors is an integer number (115715544).

Almost surely, 2^231431087 is an apocalyptic number.

231431087 is a deficient number, since it is larger than the sum of its proper divisors (1).

231431087 is an equidigital number, since it uses as much as digits as its factorization.

231431087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 231431087 is about 15212.8592644512. The cubic root of 231431087 is about 613.9606893739.

The spelling of 231431087 in words is "two hundred thirty-one million, four hundred thirty-one thousand, eighty-seven".