4085564809 has 2 divisors, whose sum is σ = 4085564810. Its totient is φ = 4085564808.

The previous prime is 4085564801. The next prime is 4085564839. The reversal of 4085564809 is 9084655804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2459862409 + 1625702400 = 49597^2 + 40320^2 .

It is a cyclic number.

It is not a de Polignac number, because 4085564809 - 2³ = 4085564801 is a prime.

It is not a weakly prime, because it can be changed into another prime (4085564801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2042782404 + 2042782405.

It is an arithmetic number, because the mean of its divisors is an integer number (2042782405).

Almost surely, 2^4085564809 is an apocalyptic number.

It is an amenable number.

4085564809 is a deficient number, since it is larger than the sum of its proper divisors (1).

4085564809 is an equidigital number, since it uses as much as digits as its factorization.

4085564809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1382400, while the sum is 49.

The square root of 4085564809 is about 63918.4230797350. The cubic root of 4085564809 is about 1598.6400956620.

The spelling of 4085564809 in words is "four billion, eighty-five million, five hundred sixty-four thousand, eight hundred nine".