79957221 has 4 divisors (see below), whose sum is σ = 106609632. Its totient is φ = 53304812.

The previous prime is 79957219. The next prime is 79957237. The reversal of 79957221 is 12275997.

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.

It is a cyclic number.

It is not a de Polignac number, because 79957221 - 2¹ = 79957219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79957271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13326201 + ... + 13326206.

It is an arithmetic number, because the mean of its divisors is an integer number (26652408).

Almost surely, 2^79957221 is an apocalyptic number.

It is an amenable number.

79957221 is a deficient number, since it is larger than the sum of its proper divisors (26652411).

79957221 is a wasteful number, since it uses less digits than its factorization.

79957221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26652410.

The product of its digits is 79380, while the sum is 42.

The square root of 79957221 is about 8941.8801714181. The cubic root of 79957221 is about 430.8101205110.

The spelling of 79957221 in words is "seventy-nine million, nine hundred fifty-seven thousand, two hundred twenty-one".