31557656057 has 2 divisors, whose sum is σ = 31557656058. Its totient is φ = 31557656056.

The previous prime is 31557656047. The next prime is 31557656101. The reversal of 31557656057 is 75065675513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20706058816 + 10851597241 = 143896^2 + 104171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31557656057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31557655996 and 31557656014.

It is not a weakly prime, because it can be changed into another prime (31557656047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15778828028 + 15778828029.

It is an arithmetic number, because the mean of its divisors is an integer number (15778828029).

Almost surely, 2^31557656057 is an apocalyptic number.

It is an amenable number.

31557656057 is a deficient number, since it is larger than the sum of its proper divisors (1).

31557656057 is an equidigital number, since it uses as much as digits as its factorization.

31557656057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3307500, while the sum is 50.

The spelling of 31557656057 in words is "thirty-one billion, five hundred fifty-seven million, six hundred fifty-six thousand, fifty-seven".