79711321 has 4 divisors (see below), whose sum is σ = 80500644. Its totient is φ = 78922000.

The previous prime is 79711319. The next prime is 79711349. The reversal of 79711321 is 12311797.

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 77352025 + 2359296 = 8795^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 79711321 - 2¹ = 79711319 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79711381) 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, 394510 + ... + 394711.

It is an arithmetic number, because the mean of its divisors is an integer number (20125161).

Almost surely, 2^79711321 is an apocalyptic number.

It is an amenable number.

79711321 is a deficient number, since it is larger than the sum of its proper divisors (789323).

79711321 is a wasteful number, since it uses less digits than its factorization.

79711321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789322.

The product of its digits is 2646, while the sum is 31.

The square root of 79711321 is about 8928.1196788574. The cubic root of 79711321 is about 430.3680299707.

The spelling of 79711321 in words is "seventy-nine million, seven hundred eleven thousand, three hundred twenty-one".