2216009 has 4 divisors (see below), whose sum is σ = 2270100. Its totient is φ = 2161920.

The previous prime is 2215999. The next prime is 2216021. The reversal of 2216009 is 9006122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9006122 = 2 ⋅4503061.

It can be written as a sum of positive squares in 2 ways, for example, as 1210000 + 1006009 = 1100^2 + 1003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2216009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2216309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26984 + ... + 27065.

It is an arithmetic number, because the mean of its divisors is an integer number (567525).

2^2216009 is an apocalyptic number.

It is an amenable number.

2216009 is a deficient number, since it is larger than the sum of its proper divisors (54091).

2216009 is an equidigital number, since it uses as much as digits as its factorization.

2216009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54090.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2216009 is about 1488.6265481980. The cubic root of 2216009 is about 130.3738548019.

The spelling of 2216009 in words is "two million, two hundred sixteen thousand, nine".