2216609 has 2 divisors, whose sum is σ = 2216610. Its totient is φ = 2216608.

The previous prime is 2216603. The next prime is 2216611. The reversal of 2216609 is 9066122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1216609 + 1000000 = 1103^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216609 - 2¹⁶ = 2151073 is a prime.

Together with 2216611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2216603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108304 + 1108305.

It is an arithmetic number, because the mean of its divisors is an integer number (1108305).

2^2216609 is an apocalyptic number.

It is an amenable number.

2216609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2216609 is an equidigital number, since it uses as much as digits as its factorization.

2216609 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 2216609 is about 1488.8280626049. The cubic root of 2216609 is about 130.3856202857.

The spelling of 2216609 in words is "two million, two hundred sixteen thousand, six hundred nine".