91111117 has 4 divisors (see below), whose sum is σ = 91440316. Its totient is φ = 90781920.

The previous prime is 91111093. The next prime is 91111123. The reversal of 91111117 is 71111119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71111119 = 17 ⋅4183007.

It can be written as a sum of positive squares in 2 ways, for example, as 4639716 + 86471401 = 2154^2 + 9299^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91111117 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 (91111147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164184 + ... + 164737.

It is an arithmetic number, because the mean of its divisors is an integer number (22860079).

Almost surely, 2^91111117 is an apocalyptic number.

It is an amenable number.

91111117 is a deficient number, since it is larger than the sum of its proper divisors (329199).

91111117 is a wasteful number, since it uses less digits than its factorization.

91111117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329198.

The product of its digits is 63, while the sum is 22.

The square root of 91111117 is about 9545.2143506576. The cubic root of 91111117 is about 449.9771461645.

The spelling of 91111117 in words is "ninety-one million, one hundred eleven thousand, one hundred seventeen".