158531 has 4 divisors (see below), whose sum is σ = 161952. Its totient is φ = 155112.

The previous prime is 158527. The next prime is 158537. The reversal of 158531 is 135851.

158531 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.

It is a cyclic number.

It is not a de Polignac number, because 158531 - 2² = 158527 is a prime.

It is a super-2 number, since 2×158531² = 50264155922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 158497 and 158506.

It is not an unprimeable number, because it can be changed into a prime (158537) 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, 1640 + ... + 1733.

It is an arithmetic number, because the mean of its divisors is an integer number (40488).

2¹⁵⁸⁵³¹ is an apocalyptic number.

158531 is a deficient number, since it is larger than the sum of its proper divisors (3421).

158531 is an equidigital number, since it uses as much as digits as its factorization.

158531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420.

The product of its digits is 600, while the sum is 23.

The square root of 158531 is about 398.1595157723. The cubic root of 158531 is about 54.1216962712.

The spelling of 158531 in words is "one hundred fifty-eight thousand, five hundred thirty-one".