158791 has 2 divisors, whose sum is σ = 158792. Its totient is φ = 158790.

The previous prime is 158777. The next prime is 158803. The reversal of 158791 is 197851.

158791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 158791 - 2⁵ = 158759 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79395 + 79396.

It is an arithmetic number, because the mean of its divisors is an integer number (79396).

2¹⁵⁸⁷⁹¹ is an apocalyptic number.

158791 is a deficient number, since it is larger than the sum of its proper divisors (1).

158791 is an equidigital number, since it uses as much as digits as its factorization.

158791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 31.

The square root of 158791 is about 398.4858843171. The cubic root of 158791 is about 54.1512676805.

Subtracting 158791 from its reverse (197851), we obtain a triangular number (39060 = T₂₇₉).

It can be divided in two parts, 158 and 791, that added together give a palindrome (949).

The spelling of 158791 in words is "one hundred fifty-eight thousand, seven hundred ninety-one".