31304491957 has 2 divisors, whose sum is σ = 31304491958. Its totient is φ = 31304491956.

The previous prime is 31304491949. The next prime is 31304491993. The reversal of 31304491957 is 75919440313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24423125841 + 6881366116 = 156279^2 + 82954^2 .

It is a cyclic number.

It is not a de Polignac number, because 31304491957 - 2³ = 31304491949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31304491357) 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, 15652245978 + 15652245979.

It is an arithmetic number, because the mean of its divisors is an integer number (15652245979).

Almost surely, 2^31304491957 is an apocalyptic number.

It is an amenable number.

31304491957 is a deficient number, since it is larger than the sum of its proper divisors (1).

31304491957 is an equidigital number, since it uses as much as digits as its factorization.

31304491957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 31304491957 in words is "thirty-one billion, three hundred four million, four hundred ninety-one thousand, nine hundred fifty-seven".