91117933079 has 4 divisors (see below), whose sum is σ = 91119929976. Its totient is φ = 91115936184.

The previous prime is 91117933033. The next prime is 91117933121. The reversal of 91117933079 is 97033971119.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97033971119 = 47 ⋅2064552577.

It is a cyclic number.

It is not a de Polignac number, because 91117933079 - 2⁸ = 91117932823 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 (91117933019) 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, 928364 + ... + 1021809.

It is an arithmetic number, because the mean of its divisors is an integer number (22779982494).

Almost surely, 2^91117933079 is an apocalyptic number.

91117933079 is a deficient number, since it is larger than the sum of its proper divisors (1996897).

91117933079 is a wasteful number, since it uses less digits than its factorization.

91117933079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996896.

The product of its (nonzero) digits is 321489, while the sum is 50.

The spelling of 91117933079 in words is "ninety-one billion, one hundred seventeen million, nine hundred thirty-three thousand, seventy-nine".