91117699 has 4 divisors (see below), whose sum is σ = 91166400. Its totient is φ = 91069000.

The previous prime is 91117687. The next prime is 91117709. The reversal of 91117699 is 99671119.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91117699 - 2⁵ = 91117667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91117799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21427 + ... + 25324.

It is an arithmetic number, because the mean of its divisors is an integer number (22791600).

Almost surely, 2^91117699 is an apocalyptic number.

91117699 is a deficient number, since it is larger than the sum of its proper divisors (48701).

91117699 is a wasteful number, since it uses less digits than its factorization.

91117699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48700.

The product of its digits is 30618, while the sum is 43.

The square root of 91117699 is about 9545.5591245353. The cubic root of 91117699 is about 449.9879815720.

The spelling of 91117699 in words is "ninety-one million, one hundred seventeen thousand, six hundred ninety-nine".