158631 has 24 divisors (see below), whose sum is σ = 255360. Its totient is φ = 87120.

The previous prime is 158621. The next prime is 158633. The reversal of 158631 is 136851.

158631 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 158631 - 2⁶ = 158567 is a prime.

It is a super-2 number, since 2×158631² = 50327588322, which contains 22 as substring.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6886 + ... + 6908.

It is an arithmetic number, because the mean of its divisors is an integer number (10640).

2¹⁵⁸⁶³¹ is an apocalyptic number.

158631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

158631 is a deficient number, since it is larger than the sum of its proper divisors (96729).

158631 is a wasteful number, since it uses less digits than its factorization.

158631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67 (or 56 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 158631 is about 398.2850737851. The cubic root of 158631 is about 54.1330737138.

It can be divided in two parts, 15 and 8631, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 158631 in words is "one hundred fifty-eight thousand, six hundred thirty-one".