2158901091 has 12 divisors (see below), whose sum is σ = 3142219080. Its totient is φ = 1428279840.

The previous prime is 2158901089. The next prime is 2158901117. The reversal of 2158901091 is 1901098512.

It is not a de Polignac number, because 2158901091 - 2¹ = 2158901089 is a prime.

It is a Smith number, since the sum of its digits (36) 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 (2158901021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 914386 + ... + 916743.

It is an arithmetic number, because the mean of its divisors is an integer number (261851590).

Almost surely, 2^2158901091 is an apocalyptic number.

2158901091 is a deficient number, since it is larger than the sum of its proper divisors (983317989).

2158901091 is a wasteful number, since it uses less digits than its factorization.

2158901091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831266 (or 1831263 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 2158901091 is about 46463.9762719464. The cubic root of 2158901091 is about 1292.4415613079.

The spelling of 2158901091 in words is "two billion, one hundred fifty-eight million, nine hundred one thousand, ninety-one".