79971365 has 4 divisors (see below), whose sum is σ = 95965644. Its totient is φ = 63977088.

The previous prime is 79971341. The next prime is 79971371. The reversal of 79971365 is 56317997.

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: 56317997 = 709 ⋅79433.

It can be written as a sum of positive squares in 2 ways, for example, as 31292836 + 48678529 = 5594^2 + 6977^2 .

It is a cyclic number.

It is not a de Polignac number, because 79971365 - 2⁶ = 79971301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7997132 + ... + 7997141.

It is an arithmetic number, because the mean of its divisors is an integer number (23991411).

Almost surely, 2^79971365 is an apocalyptic number.

It is an amenable number.

79971365 is a deficient number, since it is larger than the sum of its proper divisors (15994279).

79971365 is a wasteful number, since it uses less digits than its factorization.

79971365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15994278.

The product of its digits is 357210, while the sum is 47.

The square root of 79971365 is about 8942.6710215684. The cubic root of 79971365 is about 430.8355216735.

The spelling of 79971365 in words is "seventy-nine million, nine hundred seventy-one thousand, three hundred sixty-five".