8779312909 has 2 divisors, whose sum is σ = 8779312910. Its totient is φ = 8779312908.

The previous prime is 8779312901. The next prime is 8779312921. The reversal of 8779312909 is 9092139778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6552416809 + 2226896100 = 80947^2 + 47190^2 .

It is a cyclic number.

It is not a de Polignac number, because 8779312909 - 2³ = 8779312901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8779312909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8779312901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4389656454 + 4389656455.

It is an arithmetic number, because the mean of its divisors is an integer number (4389656455).

Almost surely, 2^8779312909 is an apocalyptic number.

It is an amenable number.

8779312909 is a deficient number, since it is larger than the sum of its proper divisors (1).

8779312909 is an equidigital number, since it uses as much as digits as its factorization.

8779312909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The square root of 8779312909 is about 93697.9877532063. The cubic root of 8779312909 is about 2062.9411681632.

The spelling of 8779312909 in words is "eight billion, seven hundred seventy-nine million, three hundred twelve thousand, nine hundred nine".