79079909 has 2 divisors, whose sum is σ = 79079910. Its totient is φ = 79079908.

The previous prime is 79079893. The next prime is 79079941. The reversal of 79079909 is 90997097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76615009 + 2464900 = 8753^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 79079909 - 2⁴ = 79079893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79019909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39539954 + 39539955.

It is an arithmetic number, because the mean of its divisors is an integer number (39539955).

Almost surely, 2^79079909 is an apocalyptic number.

It is an amenable number.

79079909 is a deficient number, since it is larger than the sum of its proper divisors (1).

79079909 is an equidigital number, since it uses as much as digits as its factorization.

79079909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 321489, while the sum is 50.

The square root of 79079909 is about 8892.6885136049. The cubic root of 79079909 is about 429.2286676922.

The spelling of 79079909 in words is "seventy-nine million, seventy-nine thousand, nine hundred nine".