312431087 has 2 divisors, whose sum is σ = 312431088. Its totient is φ = 312431086.

The previous prime is 312431039. The next prime is 312431089. The reversal of 312431087 is 780134213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 312431087 - 2⁸ = 312430831 is a prime.

It is a super-2 number, since 2×312431087² = 195226368248003138, which contains 22 as substring.

Together with 312431089, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312431089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156215543 + 156215544.

It is an arithmetic number, because the mean of its divisors is an integer number (156215544).

Almost surely, 2^312431087 is an apocalyptic number.

312431087 is a deficient number, since it is larger than the sum of its proper divisors (1).

312431087 is an equidigital number, since it uses as much as digits as its factorization.

312431087 is an evil number, because the sum of its binary digits is even.

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

The square root of 312431087 is about 17675.7202682097. The cubic root of 312431087 is about 678.5545181719.

The spelling of 312431087 in words is "three hundred twelve million, four hundred thirty-one thousand, eighty-seven".