79517579 has 2 divisors, whose sum is σ = 79517580. Its totient is φ = 79517578.

The previous prime is 79517539. The next prime is 79517617. The reversal of 79517579 is 97571597.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79517579 - 2²⁰ = 78469003 is a prime.

It is not a weakly prime, because it can be changed into another prime (79517539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39758789 + 39758790.

It is an arithmetic number, because the mean of its divisors is an integer number (39758790).

Almost surely, 2^79517579 is an apocalyptic number.

79517579 is a deficient number, since it is larger than the sum of its proper divisors (1).

79517579 is an equidigital number, since it uses as much as digits as its factorization.

79517579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 694575, while the sum is 50.

The square root of 79517579 is about 8917.2629769453. The cubic root of 79517579 is about 430.0190707244.

The spelling of 79517579 in words is "seventy-nine million, five hundred seventeen thousand, five hundred seventy-nine".