158131 has 4 divisors (see below), whose sum is σ = 163264. Its totient is φ = 153000.

The previous prime is 158129. The next prime is 158141. The reversal of 158131 is 131851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131851 = 79 ⋅1669.

It is a cyclic number.

It is not a de Polignac number, because 158131 - 2¹ = 158129 is a prime.

It is a super-2 number, since 2×158131² = 50010826322, which contains 22 as substring.

It is a Duffinian number.

158131 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 158099 and 158108.

It is not an unprimeable number, because it can be changed into a prime (158141) 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, 2520 + ... + 2581.

It is an arithmetic number, because the mean of its divisors is an integer number (40816).

2¹⁵⁸¹³¹ is an apocalyptic number.

158131 is the 252-nd centered pentagonal number.

158131 is a deficient number, since it is larger than the sum of its proper divisors (5133).

158131 is an equidigital number, since it uses as much as digits as its factorization.

158131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132.

The product of its digits is 120, while the sum is 19.

The square root of 158131 is about 397.6568872785. The cubic root of 158131 is about 54.0761385952.

Adding to 158131 its reverse (131851), we get a palindrome (289982).

It can be divided in two parts, 158 and 131, that added together give a square (289 = 17²).

The spelling of 158131 in words is "one hundred fifty-eight thousand, one hundred thirty-one".