31231233157 has 2 divisors, whose sum is σ = 31231233158. Its totient is φ = 31231233156.

The previous prime is 31231233053. The next prime is 31231233191. The reversal of 31231233157 is 75133213213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27904366116 + 3326867041 = 167046^2 + 57679^2 .

It is an emirp because it is prime and its reverse (75133213213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31231233157 - 2²⁷ = 31097015429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31231233457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615616578 + 15615616579.

It is an arithmetic number, because the mean of its divisors is an integer number (15615616579).

Almost surely, 2^31231233157 is an apocalyptic number.

It is an amenable number.

31231233157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231233157 is an equidigital number, since it uses as much as digits as its factorization.

31231233157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 31.

The spelling of 31231233157 in words is "thirty-one billion, two hundred thirty-one million, two hundred thirty-three thousand, one hundred fifty-seven".