158236891 has 2 divisors, whose sum is σ = 158236892. Its totient is φ = 158236890.

The previous prime is 158236873. The next prime is 158236907. The reversal of 158236891 is 198632851.

158236891 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 an emirp because it is prime and its reverse (198632851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158236891 - 2¹⁷ = 158105819 is a prime.

It is not a weakly prime, because it can be changed into another prime (158236691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79118445 + 79118446.

It is an arithmetic number, because the mean of its divisors is an integer number (79118446).

Almost surely, 2^158236891 is an apocalyptic number.

158236891 is a deficient number, since it is larger than the sum of its proper divisors (1).

158236891 is an equidigital number, since it uses as much as digits as its factorization.

158236891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 158236891 is about 12579.2245786455. The cubic root of 158236891 is about 540.8820643495.

The spelling of 158236891 in words is "one hundred fifty-eight million, two hundred thirty-six thousand, eight hundred ninety-one".