157331 has 4 divisors (see below), whose sum is σ = 158664. Its totient is φ = 156000.

The previous prime is 157327. The next prime is 157349. The reversal of 157331 is 133751.

157331 = T₂₂₆ + T₂₂₇ + ... + T₂₃₁.

It is a happy number.

157331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133751 = 131 ⋅1021.

It is a cyclic number.

It is not a de Polignac number, because 157331 - 2² = 157327 is a prime.

It is a super-2 number, since 2×157331² = 49506087122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (157321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470 + ... + 731.

It is an arithmetic number, because the mean of its divisors is an integer number (39666).

2¹⁵⁷³³¹ is an apocalyptic number.

157331 is a deficient number, since it is larger than the sum of its proper divisors (1333).

157331 is a wasteful number, since it uses less digits than its factorization.

157331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its digits is 315, while the sum is 20.

The square root of 157331 is about 396.6497195259. The cubic root of 157331 is about 53.9847922424.

The spelling of 157331 in words is "one hundred fifty-seven thousand, three hundred thirty-one".