2218109 has 4 divisors (see below), whose sum is σ = 2348604. Its totient is φ = 2087616.

The previous prime is 2218093. The next prime is 2218121. The reversal of 2218109 is 9018122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 902500 + 1315609 = 950^2 + 1147^2 .

It is a cyclic number.

It is not a de Polignac number, because 2218109 - 2⁴ = 2218093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218129) 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, 65222 + ... + 65255.

It is an arithmetic number, because the mean of its divisors is an integer number (587151).

2^2218109 is an apocalyptic number.

It is an amenable number.

2218109 is a deficient number, since it is larger than the sum of its proper divisors (130495).

2218109 is a wasteful number, since it uses less digits than its factorization.

2218109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130494.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2218109 is about 1489.3317293337. The cubic root of 2218109 is about 130.4150247094.

The spelling of 2218109 in words is "two million, two hundred eighteen thousand, one hundred nine".