91116511 has 4 divisors (see below), whose sum is σ = 91675672. Its totient is φ = 90557352.

The previous prime is 91116497. The next prime is 91116517. The reversal of 91116511 is 11561119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11561119 = 883 ⋅13093.

It is a cyclic number.

It is not a de Polignac number, because 91116511 - 2⁷ = 91116383 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 (91116517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279336 + ... + 279661.

It is an arithmetic number, because the mean of its divisors is an integer number (22918918).

Almost surely, 2^91116511 is an apocalyptic number.

91116511 is a deficient number, since it is larger than the sum of its proper divisors (559161).

91116511 is a wasteful number, since it uses less digits than its factorization.

91116511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559160.

The product of its digits is 270, while the sum is 25.

The square root of 91116511 is about 9545.4968964428. The cubic root of 91116511 is about 449.9860259035.

The spelling of 91116511 in words is "ninety-one million, one hundred sixteen thousand, five hundred eleven".