158535891 has 24 divisors (see below), whose sum is σ = 240414720. Its totient is φ = 100537200.

The previous prime is 158535877. The next prime is 158535929. The reversal of 158535891 is 198535851.

158535891 is a `hidden beast` number, since 15 + 8 + 53 + 589 + 1 = 666.

It is not a de Polignac number, because 158535891 - 2⁵ = 158535859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158535191) 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 in 23 ways as a sum of consecutive naturals, for example, 11646 + ... + 21276.

It is an arithmetic number, because the mean of its divisors is an integer number (10017280).

Almost surely, 2^158535891 is an apocalyptic number.

158535891 is a deficient number, since it is larger than the sum of its proper divisors (81878829).

158535891 is a wasteful number, since it uses less digits than its factorization.

158535891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9727 (or 9724 counting only the distinct ones).

The product of its digits is 216000, while the sum is 45.

The square root of 158535891 is about 12591.1036450345. The cubic root of 158535891 is about 541.2225285319. Note that the first 3 decimals are identical.

The spelling of 158535891 in words is "one hundred fifty-eight million, five hundred thirty-five thousand, eight hundred ninety-one".