31120012111157 has 2 divisors, whose sum is σ = 31120012111158. Its totient is φ = 31120012111156.

The previous prime is 31120012111147. The next prime is 31120012111241. The reversal of 31120012111157 is 75111121002113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17329120306276 + 13790891804881 = 4162826^2 + 3713609^2 .

It is a cyclic number.

It is not a de Polignac number, because 31120012111157 - 2²² = 31120007916853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31120012111147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560006055578 + 15560006055579.

It is an arithmetic number, because the mean of its divisors is an integer number (15560006055579).

Almost surely, 2^{31120012111157} is an apocalyptic number.

It is an amenable number.

31120012111157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31120012111157 is an equidigital number, since it uses as much as digits as its factorization.

31120012111157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 26.

The spelling of 31120012111157 in words is "thirty-one trillion, one hundred twenty billion, twelve million, one hundred eleven thousand, one hundred fifty-seven".