79591221 has 8 divisors (see below), whose sum is σ = 117912960. Its totient is φ = 53060796.

The previous prime is 79591217. The next prime is 79591223. The reversal of 79591221 is 12219597.

It is not a de Polignac number, because 79591221 - 2² = 79591217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79591223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1473885 + ... + 1473938.

It is an arithmetic number, because the mean of its divisors is an integer number (14739120).

Almost surely, 2^79591221 is an apocalyptic number.

It is an amenable number.

79591221 is a deficient number, since it is larger than the sum of its proper divisors (38321739).

79591221 is a wasteful number, since it uses less digits than its factorization.

79591221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2947832 (or 2947826 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 79591221 is about 8921.3912031701. The cubic root of 79591221 is about 430.1517780410.

It can be divided in two parts, 7959 and 1221, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 79591221 in words is "seventy-nine million, five hundred ninety-one thousand, two hundred twenty-one".