2009209 has 2 divisors, whose sum is σ = 2009210. Its totient is φ = 2009208.

The previous prime is 2009191. The next prime is 2009219. The reversal of 2009209 is 9029002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1951609 + 57600 = 1397^2 + 240^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009209 - 2⁹ = 2008697 is a prime.

It is a super-3 number, since 3×2009209³ = 24333052845184548987, which contains 333 as substring.

2009209 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2009209.

It is not a weakly prime, because it can be changed into another prime (2009219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004604 + 1004605.

It is an arithmetic number, because the mean of its divisors is an integer number (1004605).

2^2009209 is an apocalyptic number.

It is an amenable number.

2009209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009209 is an equidigital number, since it uses as much as digits as its factorization.

2009209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 2009209 is about 1417.4656962340. The cubic root of 2009209 is about 126.1851858276.

It can be divided in two parts, 200 and 9209, that added together give a square (9409 = 97²).

The spelling of 2009209 in words is "two million, nine thousand, two hundred nine".