2216909 has 2 divisors, whose sum is σ = 2216910. Its totient is φ = 2216908.

The previous prime is 2216897. The next prime is 2216917. The reversal of 2216909 is 9096122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1747684 + 469225 = 1322^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216909 - 2⁸ = 2216653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2216969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108454 + 1108455.

It is an arithmetic number, because the mean of its divisors is an integer number (1108455).

2^2216909 is an apocalyptic number.

It is an amenable number.

2216909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2216909 is an equidigital number, since it uses as much as digits as its factorization.

2216909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 2216909 is about 1488.9288095809. The cubic root of 2216909 is about 130.3915022314.

It can be divided in two parts, 2216 and 909, that added together give a 5-th power (3125 = 5⁵).

The spelling of 2216909 in words is "two million, two hundred sixteen thousand, nine hundred nine".