2009207209 has 2 divisors, whose sum is σ = 2009207210. Its totient is φ = 2009207208.

The previous prime is 2009207197. The next prime is 2009207219. The reversal of 2009207209 is 9027029002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1104099984 + 905107225 = 33228^2 + 30085^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009207209 - 2⁹ = 2009206697 is a prime.

It is not a weakly prime, because it can be changed into another prime (2009207219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004603604 + 1004603605.

It is an arithmetic number, because the mean of its divisors is an integer number (1004603605).

Almost surely, 2^2009207209 is an apocalyptic number.

It is an amenable number.

2009207209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009207209 is an equidigital number, since it uses as much as digits as its factorization.

2009207209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 2009207209 is about 44824.1810745049. The cubic root of 2009207209 is about 1261.8514833394.

The spelling of 2009207209 in words is "two billion, nine million, two hundred seven thousand, two hundred nine".