4085564909 has 2 divisors, whose sum is σ = 4085564910. Its totient is φ = 4085564908.

The previous prime is 4085564849. The next prime is 4085564929. The reversal of 4085564909 is 9094655804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3998665225 + 86899684 = 63235^2 + 9322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4085564909 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 (4085564929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2042782454 + 2042782455.

It is an arithmetic number, because the mean of its divisors is an integer number (2042782455).

Almost surely, 2^4085564909 is an apocalyptic number.

It is an amenable number.

4085564909 is a deficient number, since it is larger than the sum of its proper divisors (1).

4085564909 is an equidigital number, since it uses as much as digits as its factorization.

4085564909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 4085564909 is about 63918.4238619821. The cubic root of 4085564909 is about 1598.6401087050.

The spelling of 4085564909 in words is "four billion, eighty-five million, five hundred sixty-four thousand, nine hundred nine".