158331 has 8 divisors (see below), whose sum is σ = 213840. Its totient is φ = 104192.

The previous prime is 158329. The next prime is 158341. The reversal of 158331 is 133851.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158331 - 2¹ = 158329 is a prime.

It is a super-2 number, since 2×158331² = 50137411122, which contains 22 as substring.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 158298 and 158307.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 158331.

It is not an unprimeable number, because it can be changed into a prime (158341) 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 7 ways as a sum of consecutive naturals, for example, 30 + ... + 563.

It is an arithmetic number, because the mean of its divisors is an integer number (26730).

2¹⁵⁸³³¹ is an apocalyptic number.

158331 is a deficient number, since it is larger than the sum of its proper divisors (55509).

158331 is an equidigital number, since it uses as much as digits as its factorization.

158331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

The product of its digits is 360, while the sum is 21.

The square root of 158331 is about 397.9082808890. The cubic root of 158331 is about 54.0989270244.

The spelling of 158331 in words is "one hundred fifty-eight thousand, three hundred thirty-one".