91579 has 4 divisors (see below), whose sum is σ = 96984. Its totient is φ = 86176.

The previous prime is 91577. The next prime is 91583. The reversal of 91579 is 97519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97519 = 113 ⋅863.

It is a cyclic number.

It is not a de Polignac number, because 91579 - 2¹ = 91577 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91579.

It is not an unprimeable number, because it can be changed into a prime (91571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2677 + ... + 2710.

It is an arithmetic number, because the mean of its divisors is an integer number (24246).

2⁹¹⁵⁷⁹ is an apocalyptic number.

91579 is a deficient number, since it is larger than the sum of its proper divisors (5405).

91579 is a wasteful number, since it uses less digits than its factorization.

91579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5404.

The product of its digits is 2835, while the sum is 31.

The square root of 91579 is about 302.6202240433. The cubic root of 91579 is about 45.0746087427.

The spelling of 91579 in words is "ninety-one thousand, five hundred seventy-nine".