91715279 has 4 divisors (see below), whose sum is σ = 91794120. Its totient is φ = 91636440.

The previous prime is 91715263. The next prime is 91715291. The reversal of 91715279 is 97251719.

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: 97251719 = 607 ⋅160217.

It is a cyclic number.

It is not a de Polignac number, because 91715279 - 2⁴ = 91715263 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 (91715579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37649 + ... + 40010.

It is an arithmetic number, because the mean of its divisors is an integer number (22948530).

Almost surely, 2^91715279 is an apocalyptic number.

91715279 is a deficient number, since it is larger than the sum of its proper divisors (78841).

91715279 is a wasteful number, since it uses less digits than its factorization.

91715279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78840.

The product of its digits is 39690, while the sum is 41.

The square root of 91715279 is about 9576.8094373857. The cubic root of 91715279 is about 450.9695621728.

The spelling of 91715279 in words is "ninety-one million, seven hundred fifteen thousand, two hundred seventy-nine".