79243599989 has 2 divisors, whose sum is σ = 79243599990. Its totient is φ = 79243599988.

The previous prime is 79243599983. The next prime is 79243600031. The reversal of 79243599989 is 98999534297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47360640625 + 31882959364 = 217625^2 + 178558^2 .

It is an emirp because it is prime and its reverse (98999534297) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79243599989 - 2⁴ = 79243599973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79243599983) 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, 39621799994 + 39621799995.

It is an arithmetic number, because the mean of its divisors is an integer number (39621799995).

Almost surely, 2^79243599989 is an apocalyptic number.

It is an amenable number.

79243599989 is a deficient number, since it is larger than the sum of its proper divisors (1).

79243599989 is an equidigital number, since it uses as much as digits as its factorization.

79243599989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396809280, while the sum is 74.

The spelling of 79243599989 in words is "seventy-nine billion, two hundred forty-three million, five hundred ninety-nine thousand, nine hundred eighty-nine".