79319221 has 4 divisors (see below), whose sum is σ = 81006912. Its totient is φ = 77631532.

The previous prime is 79319213. The next prime is 79319237. The reversal of 79319221 is 12291397.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12291397 = 101 ⋅121697.

It is a cyclic number.

It is not a de Polignac number, because 79319221 - 2³ = 79319213 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 (79319291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843775 + ... + 843868.

It is an arithmetic number, because the mean of its divisors is an integer number (20251728).

Almost surely, 2^79319221 is an apocalyptic number.

It is an amenable number.

79319221 is a deficient number, since it is larger than the sum of its proper divisors (1687691).

79319221 is a wasteful number, since it uses less digits than its factorization.

79319221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687690.

The product of its digits is 6804, while the sum is 34.

The square root of 79319221 is about 8906.1338974889. The cubic root of 79319221 is about 429.6612096161.

The spelling of 79319221 in words is "seventy-nine million, three hundred nineteen thousand, two hundred twenty-one".