79849817 has 2 divisors, whose sum is σ = 79849818. Its totient is φ = 79849816.

The previous prime is 79849787. The next prime is 79849829. The reversal of 79849817 is 71894897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76405081 + 3444736 = 8741^2 + 1856^2 .

It is an emirp because it is prime and its reverse (71894897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79849817 - 2²⁶ = 12740953 is a prime.

It is not a weakly prime, because it can be changed into another prime (79849897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39924908 + 39924909.

It is an arithmetic number, because the mean of its divisors is an integer number (39924909).

Almost surely, 2^79849817 is an apocalyptic number.

It is an amenable number.

79849817 is a deficient number, since it is larger than the sum of its proper divisors (1).

79849817 is an equidigital number, since it uses as much as digits as its factorization.

79849817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The square root of 79849817 is about 8935.8724811850. The cubic root of 79849817 is about 430.6171362165.

The spelling of 79849817 in words is "seventy-nine million, eight hundred forty-nine thousand, eight hundred seventeen".