91591079 has 4 divisors (see below), whose sum is σ = 91612176. Its totient is φ = 91569984.

The previous prime is 91591067. The next prime is 91591111. The reversal of 91591079 is 97019519.

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 91591079 - 2²⁴ = 74813863 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 (91591979) 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, 1379 + ... + 13604.

It is an arithmetic number, because the mean of its divisors is an integer number (22903044).

Almost surely, 2^91591079 is an apocalyptic number.

91591079 is a deficient number, since it is larger than the sum of its proper divisors (21097).

91591079 is a wasteful number, since it uses less digits than its factorization.

91591079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21096.

The product of its (nonzero) digits is 25515, while the sum is 41.

The square root of 91591079 is about 9570.3228263210. The cubic root of 91591079 is about 450.7659039158.

The spelling of 91591079 in words is "ninety-one million, five hundred ninety-one thousand, seventy-nine".