158091 has 4 divisors (see below), whose sum is σ = 210792. Its totient is φ = 105392.

The previous prime is 158077. The next prime is 158113. The reversal of 158091 is 190851.

158091 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 an emirpimes, since its reverse is a distinct semiprime: 190851 = 3 ⋅63617.

It is a cyclic number.

It is not a de Polignac number, because 158091 - 2⁹ = 157579 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (158071) 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, 26346 + ... + 26351.

It is an arithmetic number, because the mean of its divisors is an integer number (52698).

2¹⁵⁸⁰⁹¹ is an apocalyptic number.

158091 is a deficient number, since it is larger than the sum of its proper divisors (52701).

158091 is an equidigital number, since it uses as much as digits as its factorization.

158091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52700.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 158091 is about 397.6065894826. The cubic root of 158091 is about 54.0715786039.

The spelling of 158091 in words is "one hundred fifty-eight thousand, ninety-one".