79225217 has 2 divisors, whose sum is σ = 79225218. Its totient is φ = 79225216.

The previous prime is 79225213. The next prime is 79225241. The reversal of 79225217 is 71252297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63984001 + 15241216 = 7999^2 + 3904^2 .

It is an emirp because it is prime and its reverse (71252297) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79225217 - 2² = 79225213 is a prime.

It is not a weakly prime, because it can be changed into another prime (79225213) 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 as a sum of consecutive naturals, namely, 39612608 + 39612609.

It is an arithmetic number, because the mean of its divisors is an integer number (39612609).

Almost surely, 2^79225217 is an apocalyptic number.

It is an amenable number.

79225217 is a deficient number, since it is larger than the sum of its proper divisors (1).

79225217 is an equidigital number, since it uses as much as digits as its factorization.

79225217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 35.

The square root of 79225217 is about 8900.8548465864. The cubic root of 79225217 is about 429.4914069791.

The spelling of 79225217 in words is "seventy-nine million, two hundred twenty-five thousand, two hundred seventeen".