158969891 has 8 divisors (see below), whose sum is σ = 165694464. Its totient is φ = 152345160.

The previous prime is 158969887. The next prime is 158969893. The reversal of 158969891 is 198969851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 158969891 - 2² = 158969887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158969893) 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 7 ways as a sum of consecutive naturals, for example, 21701 + ... + 28086.

It is an arithmetic number, because the mean of its divisors is an integer number (20711808).

Almost surely, 2^158969891 is an apocalyptic number.

158969891 is a deficient number, since it is larger than the sum of its proper divisors (6724573).

158969891 is a wasteful number, since it uses less digits than its factorization.

158969891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49921.

The product of its digits is 1399680, while the sum is 56.

The square root of 158969891 is about 12608.3262568828. The cubic root of 158969891 is about 541.7159532062.

The spelling of 158969891 in words is "one hundred fifty-eight million, nine hundred sixty-nine thousand, eight hundred ninety-one".