158591 has 2 divisors, whose sum is σ = 158592. Its totient is φ = 158590.

The previous prime is 158581. The next prime is 158597. The reversal of 158591 is 195851.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 158591 - 2⁶ = 158527 is a prime.

It is a super-2 number, since 2×158591² = 50302210562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79295 + 79296.

It is an arithmetic number, because the mean of its divisors is an integer number (79296).

2¹⁵⁸⁵⁹¹ is an apocalyptic number.

158591 is a deficient number, since it is larger than the sum of its proper divisors (1).

158591 is an equidigital number, since it uses as much as digits as its factorization.

158591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 29.

The square root of 158591 is about 398.2348553304. The cubic root of 158591 is about 54.1285233107.

The spelling of 158591 in words is "one hundred fifty-eight thousand, five hundred ninety-one".