91016091 has 12 divisors (see below), whose sum is σ = 132034968. Its totient is φ = 60415584.

The previous prime is 91016069. The next prime is 91016119. The reversal of 91016091 is 19061019.

It is not a de Polignac number, because 91016091 - 2⁶ = 91016027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91016491) 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, 19605 + ... + 23798.

It is an arithmetic number, because the mean of its divisors is an integer number (11002914).

Almost surely, 2^91016091 is an apocalyptic number.

91016091 is a deficient number, since it is larger than the sum of its proper divisors (41018877).

91016091 is a wasteful number, since it uses less digits than its factorization.

91016091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43642 (or 43639 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 91016091 is about 9540.2353744549. The cubic root of 91016091 is about 449.8206544580.

The spelling of 91016091 in words is "ninety-one million, sixteen thousand, ninety-one".