79194313909 has 2 divisors, whose sum is σ = 79194313910. Its totient is φ = 79194313908.

The previous prime is 79194313889. The next prime is 79194313921. The reversal of 79194313909 is 90931349197.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79117313284 + 77000625 = 281278^2 + 8775^2 .

It is a cyclic number.

It is not a de Polignac number, because 79194313909 - 2¹⁵ = 79194281141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79194313909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79194313999) 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, 39597156954 + 39597156955.

It is an arithmetic number, because the mean of its divisors is an integer number (39597156955).

Almost surely, 2^79194313909 is an apocalyptic number.

It is an amenable number.

79194313909 is a deficient number, since it is larger than the sum of its proper divisors (1).

79194313909 is an equidigital number, since it uses as much as digits as its factorization.

79194313909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1653372, while the sum is 55.

The spelling of 79194313909 in words is "seventy-nine billion, one hundred ninety-four million, three hundred thirteen thousand, nine hundred nine".