158931 has 6 divisors (see below), whose sum is σ = 229580.
Its totient is φ = 105948.
The previous prime is 158927. The next prime is 158941. The reversal of 158931 is 139851.
It is not a de Polignac number, because 158931 - 22 = 158927 is a prime.
It is a super-2 number, since 2×1589312 = 50518125522, which contains 22 as substring.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 158895 and 158904.
It is not an unprimeable number, because it can be changed into a prime (158941) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8821 + ... + 8838.
2158931 is an apocalyptic number.
158931 is a deficient number, since it is larger than the sum of its proper divisors (70649).
158931 is a wasteful number, since it uses less digits than its factorization.
158931 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 17665 (or 17662 counting only the distinct ones).
The product of its digits is 1080, while the sum is 27.
The square root of 158931 is about 398.6615105575.
The cubic root of 158931 is about 54.1671773785.
It can be divided in two parts, 158 and 931, that added together give a square (1089 = 332).
The spelling of 158931 in words is "one hundred fifty-eight thousand, nine hundred thirty-one".