8409806729 has 2 divisors, whose sum is σ = 8409806730. Its totient is φ = 8409806728.

The previous prime is 8409806707. The next prime is 8409806749. The reversal of 8409806729 is 9276089048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7925806729 + 484000000 = 89027^2 + 22000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8409806729 is a prime.

It is not a weakly prime, because it can be changed into another prime (8409806749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4204903364 + 4204903365.

It is an arithmetic number, because the mean of its divisors is an integer number (4204903365).

Almost surely, 2^8409806729 is an apocalyptic number.

It is an amenable number.

8409806729 is a deficient number, since it is larger than the sum of its proper divisors (1).

8409806729 is an equidigital number, since it uses as much as digits as its factorization.

8409806729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 8409806729 is about 91704.9983861294. The cubic root of 8409806729 is about 2033.5834792822.

The spelling of 8409806729 in words is "eight billion, four hundred nine million, eight hundred six thousand, seven hundred twenty-nine".