2158083891 has 20 divisors (see below), whose sum is σ = 3225379872. Its totient is φ = 1438019568.

The previous prime is 2158083883. The next prime is 2158083899. The reversal of 2158083891 is 1983808512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2158083883) and next prime (2158083899).

It is not a de Polignac number, because 2158083891 - 2³ = 2158083883 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2158083899) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 200745 + ... + 211221.

Almost surely, 2^2158083891 is an apocalyptic number.

2158083891 is a deficient number, since it is larger than the sum of its proper divisors (1067295981).

2158083891 is a wasteful number, since it uses less digits than its factorization.

2158083891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13032 (or 13023 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 2158083891 is about 46455.1815301587. The cubic root of 2158083891 is about 1292.2784665217.

The spelling of 2158083891 in words is "two billion, one hundred fifty-eight million, eighty-three thousand, eight hundred ninety-one".