79517797 has 4 divisors (see below), whose sum is σ = 82259820. Its totient is φ = 76775776.

The previous prime is 79517783. The next prime is 79517827. The reversal of 79517797 is 79771597.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56535361 + 22982436 = 7519^2 + 4794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79517797 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 (79517777) 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, 1370968 + ... + 1371025.

It is an arithmetic number, because the mean of its divisors is an integer number (20564955).

Almost surely, 2^79517797 is an apocalyptic number.

It is an amenable number.

79517797 is a deficient number, since it is larger than the sum of its proper divisors (2742023).

79517797 is a wasteful number, since it uses less digits than its factorization.

79517797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742022.

The product of its digits is 972405, while the sum is 52.

The square root of 79517797 is about 8917.2752004186. The cubic root of 79517797 is about 430.0194636944.

The spelling of 79517797 in words is "seventy-nine million, five hundred seventeen thousand, seven hundred ninety-seven".