31112313157 has 2 divisors, whose sum is σ = 31112313158. Its totient is φ = 31112313156.

The previous prime is 31112313151. The next prime is 31112313227. The reversal of 31112313157 is 75131321113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22046607361 + 9065705796 = 148481^2 + 95214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31112313157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31112313151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556156578 + 15556156579.

It is an arithmetic number, because the mean of its divisors is an integer number (15556156579).

Almost surely, 2^31112313157 is an apocalyptic number.

It is an amenable number.

31112313157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31112313157 is an equidigital number, since it uses as much as digits as its factorization.

31112313157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 28.

The spelling of 31112313157 in words is "thirty-one billion, one hundred twelve million, three hundred thirteen thousand, one hundred fifty-seven".