157991316 has 24 divisors (see below), whose sum is σ = 421310400. Its totient is φ = 45140352.

The previous prime is 157991303. The next prime is 157991341. The reversal of 157991316 is 613199751.

It is a super-2 number, since 2×157991316² = 49922511862823712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 940341 + ... + 940508.

It is an arithmetic number, because the mean of its divisors is an integer number (17554600).

Almost surely, 2^157991316 is an apocalyptic number.

It is an amenable number.

157991316 is an abundant number, since it is smaller than the sum of its proper divisors (263319084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

157991316 is a wasteful number, since it uses less digits than its factorization.

157991316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880863 (or 1880861 counting only the distinct ones).

The product of its digits is 51030, while the sum is 42.

The square root of 157991316 is about 12569.4596542572. The cubic root of 157991316 is about 540.6021130164.

The spelling of 157991316 in words is "one hundred fifty-seven million, nine hundred ninety-one thousand, three hundred sixteen".