91915971191 has 8 divisors (see below), whose sum is σ = 100936023168. Its totient is φ = 83006595000.

The previous prime is 91915971151. The next prime is 91915971197. The reversal of 91915971191 is 19117951919.

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

It is a cyclic number.

It is not a de Polignac number, because 91915971191 - 2²⁶ = 91848862327 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 (91915971197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27667205 + ... + 27670526.

It is an arithmetic number, because the mean of its divisors is an integer number (12617002896).

Almost surely, 2^91915971191 is an apocalyptic number.

91915971191 is a deficient number, since it is larger than the sum of its proper divisors (9020051977).

91915971191 is a wasteful number, since it uses less digits than its factorization.

91915971191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55337893.

The product of its digits is 229635, while the sum is 53.

The spelling of 91915971191 in words is "ninety-one billion, nine hundred fifteen million, nine hundred seventy-one thousand, one hundred ninety-one".