157138631 has 8 divisors (see below), whose sum is σ = 170306304. Its totient is φ = 144125280.

The previous prime is 157138627. The next prime is 157138649. The reversal of 157138631 is 136831751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157138631 - 2² = 157138627 is a prime.

It is a super-2 number, since 2×157138631² = 49385098705108322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157138591 and 157138600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157138601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36455 + ... + 40536.

It is an arithmetic number, because the mean of its divisors is an integer number (21288288).

Almost surely, 2^157138631 is an apocalyptic number.

157138631 is a deficient number, since it is larger than the sum of its proper divisors (13167673).

157138631 is a wasteful number, since it uses less digits than its factorization.

157138631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77161.

The product of its digits is 15120, while the sum is 35.

The square root of 157138631 is about 12535.4948446402. The cubic root of 157138631 is about 539.6278082285.

The spelling of 157138631 in words is "one hundred fifty-seven million, one hundred thirty-eight thousand, six hundred thirty-one".