158605 has 4 divisors (see below), whose sum is σ = 190332. Its totient is φ = 126880.

The previous prime is 158597. The next prime is 158611. The reversal of 158605 is 506851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506851 = 23 ⋅22037.

It can be written as a sum of positive squares in 2 ways, for example, as 24649 + 133956 = 157^2 + 366^2 .

It is not a de Polignac number, because 158605 - 2³ = 158597 is a prime.

It is a Duffinian number.

158605 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 158605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15856 + ... + 15865.

It is an arithmetic number, because the mean of its divisors is an integer number (47583).

2¹⁵⁸⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

158605 is a deficient number, since it is larger than the sum of its proper divisors (31727).

158605 is an equidigital number, since it uses as much as digits as its factorization.

158605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31726.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 158605 is about 398.2524325098. The cubic root of 158605 is about 54.1301160388.

The spelling of 158605 in words is "one hundred fifty-eight thousand, six hundred five".