2243621 has 2 divisors, whose sum is σ = 2243622. Its totient is φ = 2243620.

The previous prime is 2243617. The next prime is 2243623. The reversal of 2243621 is 1263422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1768900 + 474721 = 1330^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 2243621 - 2² = 2243617 is a prime.

It is a Sophie Germain prime.

Together with 2243623, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2243593 and 2243602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2243623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1121810 + 1121811.

It is an arithmetic number, because the mean of its divisors is an integer number (1121811).

2^2243621 is an apocalyptic number.

It is an amenable number.

2243621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2243621 is an equidigital number, since it uses as much as digits as its factorization.

2243621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 20.

The square root of 2243621 is about 1497.8721574287. The cubic root of 2243621 is about 130.9131176131.

The spelling of 2243621 in words is "two million, two hundred forty-three thousand, six hundred twenty-one".