91579013 has 6 divisors (see below), whose sum is σ = 94846674. Its totient is φ = 88420304.

The previous prime is 91579009. The next prime is 91579027. The reversal of 91579013 is 31097519.

It can be written as a sum of positive squares in 3 ways, for example, as 13557124 + 78021889 = 3682^2 + 8833^2 .

It is not a de Polignac number, because 91579013 - 2² = 91579009 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 (91579003) 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 5 ways as a sum of consecutive naturals, for example, 53606 + ... + 55287.

It is an arithmetic number, because the mean of its divisors is an integer number (15807779).

Almost surely, 2^91579013 is an apocalyptic number.

It is an amenable number.

91579013 is a deficient number, since it is larger than the sum of its proper divisors (3267661).

91579013 is a wasteful number, since it uses less digits than its factorization.

91579013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108951 (or 108922 counting only the distinct ones).

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 91579013 is about 9569.6924192996. The cubic root of 91579013 is about 450.7461087555.

The spelling of 91579013 in words is "ninety-one million, five hundred seventy-nine thousand, thirteen".