2243909 has 2 divisors, whose sum is σ = 2243910. Its totient is φ = 2243908.

The previous prime is 2243893. The next prime is 2243911. The reversal of 2243909 is 9093422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1555009 + 688900 = 1247^2 + 830^2 .

It is a cyclic number.

It is not a de Polignac number, because 2243909 - 2⁴ = 2243893 is a prime.

Together with 2243911, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₁₆₅₆₆₅ and since 2243909 and 165665 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2243959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1121954 + 1121955.

It is an arithmetic number, because the mean of its divisors is an integer number (1121955).

2^2243909 is an apocalyptic number.

It is an amenable number.

2243909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2243909 is an equidigital number, since it uses as much as digits as its factorization.

2243909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 2243909 is about 1497.9682907191. The cubic root of 2243909 is about 130.9187188807.

The spelling of 2243909 in words is "two million, two hundred forty-three thousand, nine hundred nine".