79512217 has 2 divisors, whose sum is σ = 79512218. Its totient is φ = 79512216.

The previous prime is 79512187. The next prime is 79512239. The reversal of 79512217 is 71221597.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79495056 + 17161 = 8916^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 79512217 - 2⁷ = 79512089 is a prime.

It is equal to p_4642648 and since 79512217 and 4642648 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (79512617) 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 as a sum of consecutive naturals, namely, 39756108 + 39756109.

It is an arithmetic number, because the mean of its divisors is an integer number (39756109).

Almost surely, 2^79512217 is an apocalyptic number.

It is an amenable number.

79512217 is a deficient number, since it is larger than the sum of its proper divisors (1).

79512217 is an equidigital number, since it uses as much as digits as its factorization.

79512217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 34.

The square root of 79512217 is about 8916.9623190860. The cubic root of 79512217 is about 430.0094048781.

The spelling of 79512217 in words is "seventy-nine million, five hundred twelve thousand, two hundred seventeen".