2243209 has 2 divisors, whose sum is σ = 2243210. Its totient is φ = 2243208.

The previous prime is 2243207. The next prime is 2243221. The reversal of 2243209 is 9023422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1951609 + 291600 = 1397^2 + 540^2 .

It is a cyclic number.

It is not a de Polignac number, because 2243209 - 2¹ = 2243207 is a prime.

Together with 2243207, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2243209.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2243203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1121604 + 1121605.

It is an arithmetic number, because the mean of its divisors is an integer number (1121605).

2^2243209 is an apocalyptic number.

It is an amenable number.

2243209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2243209 is an equidigital number, since it uses as much as digits as its factorization.

2243209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 2243209 is about 1497.7346226885. The cubic root of 2243209 is about 130.9051038553.

The spelling of 2243209 in words is "two million, two hundred forty-three thousand, two hundred nine".