31311212957 has 2 divisors, whose sum is σ = 31311212958. Its totient is φ = 31311212956.

The previous prime is 31311212941. The next prime is 31311213019. The reversal of 31311212957 is 75921211313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31227837796 + 83375161 = 176714^2 + 9131^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311212957 - 2⁴ = 31311212941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31311212927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655606478 + 15655606479.

It is an arithmetic number, because the mean of its divisors is an integer number (15655606479).

Almost surely, 2^31311212957 is an apocalyptic number.

It is an amenable number.

31311212957 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311212957 is an equidigital number, since it uses as much as digits as its factorization.

31311212957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 35.

The spelling of 31311212957 in words is "thirty-one billion, three hundred eleven million, two hundred twelve thousand, nine hundred fifty-seven".