158831 has 4 divisors (see below), whose sum is σ = 168192. Its totient is φ = 149472.

The previous prime is 158803. The next prime is 158843. The reversal of 158831 is 138851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138851 = 23 ⋅6037.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158831 is a prime.

It is a super-2 number, since 2×158831² = 50454573122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 158831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158881) 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 3 ways as a sum of consecutive naturals, for example, 4655 + ... + 4688.

It is an arithmetic number, because the mean of its divisors is an integer number (42048).

2¹⁵⁸⁸³¹ is an apocalyptic number.

158831 is a deficient number, since it is larger than the sum of its proper divisors (9361).

158831 is an equidigital number, since it uses as much as digits as its factorization.

158831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9360.

The product of its digits is 960, while the sum is 26.

The square root of 158831 is about 398.5360711404. The cubic root of 158831 is about 54.1558142624.

It can be divided in two parts, 158 and 831, that added together give a palindrome (989).

The spelling of 158831 in words is "one hundred fifty-eight thousand, eight hundred thirty-one".