157931313 has 4 divisors (see below), whose sum is σ = 210575088. Its totient is φ = 105287540.

The previous prime is 157931297. The next prime is 157931341. The reversal of 157931313 is 313139751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 313139751 = 3 ⋅104379917.

It is a cyclic number.

It is not a de Polignac number, because 157931313 - 2⁴ = 157931297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157931113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26321883 + ... + 26321888.

It is an arithmetic number, because the mean of its divisors is an integer number (52643772).

Almost surely, 2^157931313 is an apocalyptic number.

It is an amenable number.

157931313 is a deficient number, since it is larger than the sum of its proper divisors (52643775).

157931313 is an equidigital number, since it uses as much as digits as its factorization.

157931313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52643774.

The product of its digits is 8505, while the sum is 33.

The square root of 157931313 is about 12567.0725708098. The cubic root of 157931313 is about 540.5336665204.

The spelling of 157931313 in words is "one hundred fifty-seven million, nine hundred thirty-one thousand, three hundred thirteen".