79212517 has 2 divisors, whose sum is σ = 79212518. Its totient is φ = 79212516.

The previous prime is 79212509. The next prime is 79212557. The reversal of 79212517 is 71521297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71808676 + 7403841 = 8474^2 + 2721^2 .

It is an emirp because it is prime and its reverse (71521297) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79212517 - 2³ = 79212509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79212557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39606258 + 39606259.

It is an arithmetic number, because the mean of its divisors is an integer number (39606259).

Almost surely, 2^79212517 is an apocalyptic number.

It is an amenable number.

79212517 is a deficient number, since it is larger than the sum of its proper divisors (1).

79212517 is an equidigital number, since it uses as much as digits as its factorization.

79212517 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 79212517 is about 8900.1414033711. The cubic root of 79212517 is about 429.4684562379.

The spelling of 79212517 in words is "seventy-nine million, two hundred twelve thousand, five hundred seventeen".