8243005609 has 2 divisors, whose sum is σ = 8243005610. Its totient is φ = 8243005608.

The previous prime is 8243005607. The next prime is 8243005711. The reversal of 8243005609 is 9065003428.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7330784400 + 912221209 = 85620^2 + 30203^2 .

It is a cyclic number.

It is not a de Polignac number, because 8243005609 - 2¹ = 8243005607 is a prime.

Together with 8243005607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8243005607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4121502804 + 4121502805.

It is an arithmetic number, because the mean of its divisors is an integer number (4121502805).

Almost surely, 2^8243005609 is an apocalyptic number.

It is an amenable number.

8243005609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8243005609 is an equidigital number, since it uses as much as digits as its factorization.

8243005609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 8243005609 is about 90790.9996034849. Note that the first 3 decimals coincide. The cubic root of 8243005609 is about 2020.0488182987.

The spelling of 8243005609 in words is "eight billion, two hundred forty-three million, five thousand, six hundred nine".