79911199 has 2 divisors, whose sum is σ = 79911200. Its totient is φ = 79911198.

The previous prime is 79911197. The next prime is 79911217. The reversal of 79911199 is 99111997.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (99111997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79911199 - 2¹ = 79911197 is a prime.

Together with 79911197, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79911197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39955599 + 39955600.

It is an arithmetic number, because the mean of its divisors is an integer number (39955600).

Almost surely, 2^79911199 is an apocalyptic number.

79911199 is a deficient number, since it is larger than the sum of its proper divisors (1).

79911199 is an equidigital number, since it uses as much as digits as its factorization.

79911199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45927, while the sum is 46.

The square root of 79911199 is about 8939.3064048616. The cubic root of 79911199 is about 430.7274490178.

The spelling of 79911199 in words is "seventy-nine million, nine hundred eleven thousand, one hundred ninety-nine".