157320891 has 96 divisors (see below), whose sum is σ = 294647808. Its totient is φ = 78693120.

The previous prime is 157320887. The next prime is 157320937. The reversal of 157320891 is 198023751.

157320891 is a `hidden beast` number, since 1 + 573 + 2 + 0 + 89 + 1 = 666.

It is not a de Polignac number, because 157320891 - 2² = 157320887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157320871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2348040 + ... + 2348106.

It is an arithmetic number, because the mean of its divisors is an integer number (3069248).

Almost surely, 2^157320891 is an apocalyptic number.

157320891 is a deficient number, since it is larger than the sum of its proper divisors (137326917).

157320891 is a wasteful number, since it uses less digits than its factorization.

157320891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 157320891 is about 12542.7624947617. The cubic root of 157320891 is about 539.8363598810.

The spelling of 157320891 in words is "one hundred fifty-seven million, three hundred twenty thousand, eight hundred ninety-one".