79279979 has 2 divisors, whose sum is σ = 79279980. Its totient is φ = 79279978.

The previous prime is 79279973. The next prime is 79280041. The reversal of 79279979 is 97997297.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79279979 - 2²⁴ = 62502763 is a prime.

It is not a weakly prime, because it can be changed into another prime (79279973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39639989 + 39639990.

It is an arithmetic number, because the mean of its divisors is an integer number (39639990).

Almost surely, 2^79279979 is an apocalyptic number.

79279979 is a deficient number, since it is larger than the sum of its proper divisors (1).

79279979 is an equidigital number, since it uses as much as digits as its factorization.

79279979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500846, while the sum is 59.

The square root of 79279979 is about 8903.9305365664. The cubic root of 79279979 is about 429.5903417724.

The spelling of 79279979 in words is "seventy-nine million, two hundred seventy-nine thousand, nine hundred seventy-nine".