79912517 has 2 divisors, whose sum is σ = 79912518. Its totient is φ = 79912516.

The previous prime is 79912471. The next prime is 79912523. The reversal of 79912517 is 71521997.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75186241 + 4726276 = 8671^2 + 2174^2 .

It is an emirp because it is prime and its reverse (71521997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79912517 - 2⁶ = 79912453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79912117) 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, 39956258 + 39956259.

It is an arithmetic number, because the mean of its divisors is an integer number (39956259).

Almost surely, 2^79912517 is an apocalyptic number.

It is an amenable number.

79912517 is a deficient number, since it is larger than the sum of its proper divisors (1).

79912517 is an equidigital number, since it uses as much as digits as its factorization.

79912517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 41.

The square root of 79912517 is about 8939.3801239236. The cubic root of 79912517 is about 430.7298170449.

The spelling of 79912517 in words is "seventy-nine million, nine hundred twelve thousand, five hundred seventeen".