31311123311857 has 2 divisors, whose sum is σ = 31311123311858. Its totient is φ = 31311123311856.

The previous prime is 31311123311837. The next prime is 31311123311869. The reversal of 31311123311857 is 75811332111313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29218251862881 + 2092871448976 = 5405391^2 + 1446676^2 .

It is an emirp because it is prime and its reverse (75811332111313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31311123311857 - 2¹⁵ = 31311123279089 is a prime.

It is not a weakly prime, because it can be changed into another prime (31311123311837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655561655928 + 15655561655929.

It is an arithmetic number, because the mean of its divisors is an integer number (15655561655929).

Almost surely, 2^{31311123311857} is an apocalyptic number.

It is an amenable number.

31311123311857 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311123311857 is an equidigital number, since it uses as much as digits as its factorization.

31311123311857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The spelling of 31311123311857 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-three million, three hundred eleven thousand, eight hundred fifty-seven".