158861 has 4 divisors (see below), whose sum is σ = 165792. Its totient is φ = 151932.

The previous prime is 158849. The next prime is 158863. The reversal of 158861 is 168851.

158861 is nontrivially palindromic in base 11.

158861 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 158861 - 2¹⁰ = 157837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 158861.

It is not an unprimeable number, because it can be changed into a prime (158863) 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, 3431 + ... + 3476.

It is an arithmetic number, because the mean of its divisors is an integer number (41448).

2¹⁵⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

158861 is a deficient number, since it is larger than the sum of its proper divisors (6931).

158861 is an equidigital number, since it uses as much as digits as its factorization.

158861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6930.

The product of its digits is 1920, while the sum is 29.

The square root of 158861 is about 398.5737071107. The cubic root of 158861 is about 54.1592236979.

The spelling of 158861 in words is "one hundred fifty-eight thousand, eight hundred sixty-one".