79251217 has 2 divisors, whose sum is σ = 79251218. Its totient is φ = 79251216.

The previous prime is 79251199. The next prime is 79251239. The reversal of 79251217 is 71215297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73942801 + 5308416 = 8599^2 + 2304^2 .

It is a cyclic number.

It is not a de Polignac number, because 79251217 - 2¹¹ = 79249169 is a prime.

It is not a weakly prime, because it can be changed into another prime (79251257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39625608 + 39625609.

It is an arithmetic number, because the mean of its divisors is an integer number (39625609).

Almost surely, 2^79251217 is an apocalyptic number.

It is an amenable number.

79251217 is a deficient number, since it is larger than the sum of its proper divisors (1).

79251217 is an equidigital number, since it uses as much as digits as its factorization.

79251217 is an evil number, because the sum of its binary digits is even.

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

The square root of 79251217 is about 8902.3152606499. The cubic root of 79251217 is about 429.5383850990.

The spelling of 79251217 in words is "seventy-nine million, two hundred fifty-one thousand, two hundred seventeen".