2209409 has 2 divisors, whose sum is σ = 2209410. Its totient is φ = 2209408.

The previous prime is 2209343. The next prime is 2209421. The reversal of 2209409 is 9049022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2093809 + 115600 = 1447^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 2209409 - 2¹⁶ = 2143873 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2209499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1104704 + 1104705.

It is an arithmetic number, because the mean of its divisors is an integer number (1104705).

2^2209409 is an apocalyptic number.

It is an amenable number.

2209409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2209409 is an equidigital number, since it uses as much as digits as its factorization.

2209409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 2209409 is about 1486.4080866303. The cubic root of 2209409 is about 130.2442940902.

The spelling of 2209409 in words is "two million, two hundred nine thousand, four hundred nine".