31512520057 has 2 divisors, whose sum is σ = 31512520058. Its totient is φ = 31512520056.

The previous prime is 31512520043. The next prime is 31512520093. The reversal of 31512520057 is 75002521513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23292559161 + 8219960896 = 152619^2 + 90664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31512520057 is a prime.

It is not a weakly prime, because it can be changed into another prime (31512520007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15756260028 + 15756260029.

It is an arithmetic number, because the mean of its divisors is an integer number (15756260029).

Almost surely, 2^31512520057 is an apocalyptic number.

It is an amenable number.

31512520057 is a deficient number, since it is larger than the sum of its proper divisors (1).

31512520057 is an equidigital number, since it uses as much as digits as its factorization.

31512520057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 31.

The spelling of 31512520057 in words is "thirty-one billion, five hundred twelve million, five hundred twenty thousand, fifty-seven".