312431291 has 2 divisors, whose sum is σ = 312431292. Its totient is φ = 312431290.

The previous prime is 312431281. The next prime is 312431359. The reversal of 312431291 is 192134213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312431291 - 2⁶ = 312431227 is a prime.

It is a super-2 number, since 2×312431291² = 195226623191853362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312431291.

It is not a weakly prime, because it can be changed into another prime (312431221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156215645 + 156215646.

It is an arithmetic number, because the mean of its divisors is an integer number (156215646).

Almost surely, 2^312431291 is an apocalyptic number.

312431291 is a deficient number, since it is larger than the sum of its proper divisors (1).

312431291 is an equidigital number, since it uses as much as digits as its factorization.

312431291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 312431291 is about 17675.7260388364. The cubic root of 312431291 is about 678.5546658579.

The spelling of 312431291 in words is "three hundred twelve million, four hundred thirty-one thousand, two hundred ninety-one".