157491 has 16 divisors (see below), whose sum is σ = 246400. Its totient is φ = 99144.

The previous prime is 157489. The next prime is 157513. The reversal of 157491 is 194751.

157491 is a `hidden beast` number, since 1 + 574 + 91 = 666.

It is not a de Polignac number, because 157491 - 2¹ = 157489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360 + ... + 666.

It is an arithmetic number, because the mean of its divisors is an integer number (15400).

2¹⁵⁷⁴⁹¹ is an apocalyptic number.

157491 is a deficient number, since it is larger than the sum of its proper divisors (88909).

157491 is a wasteful number, since it uses less digits than its factorization.

157491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 329 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 157491 is about 396.8513575635. The cubic root of 157491 is about 54.0030862434.

Subtracting from 157491 its sum of digits (27), we obtain a cube (157464 = 54³).

The spelling of 157491 in words is "one hundred fifty-seven thousand, four hundred ninety-one".