91748879 has 4 divisors (see below), whose sum is σ = 91768584. Its totient is φ = 91729176.

The previous prime is 91748873. The next prime is 91748887. The reversal of 91748879 is 97884719.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97884719 = 137 ⋅714487.

It is a cyclic number.

It is not a de Polignac number, because 91748879 - 2²⁰ = 90700303 is a prime.

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 91748879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91748873) 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, 1469 + ... + 13625.

It is an arithmetic number, because the mean of its divisors is an integer number (22942146).

Almost surely, 2^91748879 is an apocalyptic number.

91748879 is a deficient number, since it is larger than the sum of its proper divisors (19705).

91748879 is a wasteful number, since it uses less digits than its factorization.

91748879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19704.

The product of its digits is 1016064, while the sum is 53.

The square root of 91748879 is about 9578.5635144316. The cubic root of 91748879 is about 451.0246265250.

The spelling of 91748879 in words is "ninety-one million, seven hundred forty-eight thousand, eight hundred seventy-nine".