157861431 has 24 divisors (see below), whose sum is σ = 280644000. Its totient is φ = 83267136.

The previous prime is 157861427. The next prime is 157861441. The reversal of 157861431 is 134168751.

157861431 is a `hidden beast` number, since 1 + 5 + 7 + 8 + 614 + 31 = 666.

157861431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 157861431 - 2² = 157861427 is a prime.

It is a super-2 number, since 2×157861431² = 49840462794735522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157861421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95556 + ... + 97193.

It is an arithmetic number, because the mean of its divisors is an integer number (11693500).

Almost surely, 2^157861431 is an apocalyptic number.

157861431 is a deficient number, since it is larger than the sum of its proper divisors (122782569).

157861431 is a wasteful number, since it uses less digits than its factorization.

157861431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192775 (or 192772 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 157861431 is about 12564.2919020532. The cubic root of 157861431 is about 540.4539290157.

The spelling of 157861431 in words is "one hundred fifty-seven million, eight hundred sixty-one thousand, four hundred thirty-one".