91909111 has 16 divisors (see below), whose sum is σ = 107790336. Its totient is φ = 76732416.

The previous prime is 91909093. The next prime is 91909121. The reversal of 91909111 is 11190919.

It is a cyclic number.

It is not a de Polignac number, because 91909111 - 2¹¹ = 91907063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91909121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84010 + ... + 85096.

It is an arithmetic number, because the mean of its divisors is an integer number (6736896).

Almost surely, 2^91909111 is an apocalyptic number.

91909111 is a deficient number, since it is larger than the sum of its proper divisors (15881225).

91909111 is a wasteful number, since it uses less digits than its factorization.

91909111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 91909111 is about 9586.9239592270. The cubic root of 91909111 is about 451.2870331764.

The spelling of 91909111 in words is "ninety-one million, nine hundred nine thousand, one hundred eleven".