79989617 has 2 divisors, whose sum is σ = 79989618. Its totient is φ = 79989616.

The previous prime is 79989583. The next prime is 79989619. The reversal of 79989617 is 71698997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79405921 + 583696 = 8911^2 + 764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79989617 is a prime.

Together with 79989619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79989619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39994808 + 39994809.

It is an arithmetic number, because the mean of its divisors is an integer number (39994809).

Almost surely, 2^79989617 is an apocalyptic number.

It is an amenable number.

79989617 is a deficient number, since it is larger than the sum of its proper divisors (1).

79989617 is an equidigital number, since it uses as much as digits as its factorization.

79989617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 56.

The square root of 79989617 is about 8943.6914638196. The cubic root of 79989617 is about 430.8682959537.

The spelling of 79989617 in words is "seventy-nine million, nine hundred eighty-nine thousand, six hundred seventeen".