158891 has 4 divisors (see below), whose sum is σ = 164400. Its totient is φ = 153384.

The previous prime is 158881. The next prime is 158909. The reversal of 158891 is 198851.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 158891 - 2¹⁰ = 157867 is a prime.

It is a super-3 number, since 3×158891³ = 12034253336825913, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158881) 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, 2711 + ... + 2768.

It is an arithmetic number, because the mean of its divisors is an integer number (41100).

2¹⁵⁸⁸⁹¹ is an apocalyptic number.

158891 is a deficient number, since it is larger than the sum of its proper divisors (5509).

158891 is an equidigital number, since it uses as much as digits as its factorization.

158891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5508.

The product of its digits is 2880, while the sum is 32.

The square root of 158891 is about 398.6113395276. The cubic root of 158891 is about 54.1626327042.

The spelling of 158891 in words is "one hundred fifty-eight thousand, eight hundred ninety-one".