157312931 has 4 divisors (see below), whose sum is σ = 157419792. Its totient is φ = 157206072.

The previous prime is 157312891. The next prime is 157312933. The reversal of 157312931 is 139213751.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 157312931 - 2⁶ = 157312867 is a prime.

It is a super-2 number, since 2×157312931² = 49494716519621522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157312933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51191 + ... + 54176.

It is an arithmetic number, because the mean of its divisors is an integer number (39354948).

Almost surely, 2^157312931 is an apocalyptic number.

157312931 is a deficient number, since it is larger than the sum of its proper divisors (106861).

157312931 is a wasteful number, since it uses less digits than its factorization.

157312931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106860.

The product of its digits is 5670, while the sum is 32.

The square root of 157312931 is about 12542.4451762804. The cubic root of 157312931 is about 539.8272549874.

The spelling of 157312931 in words is "one hundred fifty-seven million, three hundred twelve thousand, nine hundred thirty-one".