9000990209 has 2 divisors, whose sum is σ = 9000990210. Its totient is φ = 9000990208.

The previous prime is 9000990203. The next prime is 9000990287. The reversal of 9000990209 is 9020990009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8546447809 + 454542400 = 92447^2 + 21320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9000990209 is a prime.

It is not a weakly prime, because it can be changed into another prime (9000990203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500495104 + 4500495105.

It is an arithmetic number, because the mean of its divisors is an integer number (4500495105).

Almost surely, 2^9000990209 is an apocalyptic number.

It is an amenable number.

9000990209 is a deficient number, since it is larger than the sum of its proper divisors (1).

9000990209 is an equidigital number, since it uses as much as digits as its factorization.

9000990209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 9000990209 is about 94873.5485211763. The cubic root of 9000990209 is about 2080.1601060959.

The spelling of 9000990209 in words is "nine billion, nine hundred ninety thousand, two hundred nine".