157972431 has 8 divisors (see below), whose sum is σ = 210690864. Its totient is φ = 105284480.

The previous prime is 157972427. The next prime is 157972433. The reversal of 157972431 is 134279751.

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

It is a cyclic number.

It is not a de Polignac number, because 157972431 - 2² = 157972427 is a prime.

It is a super-2 number, since 2×157972431² = 49910577912099522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157972431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157972433) 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, 10921 + ... + 20861.

It is an arithmetic number, because the mean of its divisors is an integer number (26336358).

Almost surely, 2^157972431 is an apocalyptic number.

157972431 is a deficient number, since it is larger than the sum of its proper divisors (52718433).

157972431 is an equidigital number, since it uses as much as digits as its factorization.

157972431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15241.

The product of its digits is 52920, while the sum is 39.

The square root of 157972431 is about 12568.7084061967. The cubic root of 157972431 is about 540.5805724281.

The spelling of 157972431 in words is "one hundred fifty-seven million, nine hundred seventy-two thousand, four hundred thirty-one".