79699979 has 2 divisors, whose sum is σ = 79699980. Its totient is φ = 79699978.

The previous prime is 79699967. The next prime is 79699981. The reversal of 79699979 is 97999697.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79699979 - 2¹² = 79695883 is a prime.

Together with 79699981, 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 (79699909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39849989 + 39849990.

It is an arithmetic number, because the mean of its divisors is an integer number (39849990).

Almost surely, 2^79699979 is an apocalyptic number.

79699979 is a deficient number, since it is larger than the sum of its proper divisors (1).

79699979 is an equidigital number, since it uses as much as digits as its factorization.

79699979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17360406, while the sum is 65.

The square root of 79699979 is about 8927.4844721232. The cubic root of 79699979 is about 430.3476168697.

The spelling of 79699979 in words is "seventy-nine million, six hundred ninety-nine thousand, nine hundred seventy-nine".