2218559 has 4 divisors (see below), whose sum is σ = 2535504. Its totient is φ = 1901616.

The previous prime is 2218549. The next prime is 2218561. The reversal of 2218559 is 9558122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2218559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158462 + ... + 158475.

It is an arithmetic number, because the mean of its divisors is an integer number (633876).

2^2218559 is an apocalyptic number.

2218559 is a deficient number, since it is larger than the sum of its proper divisors (316945).

2218559 is an equidigital number, since it uses as much as digits as its factorization.

2218559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316944.

The product of its digits is 7200, while the sum is 32.

The square root of 2218559 is about 1489.4827961410. The cubic root of 2218559 is about 130.4238434514.

It can be divided in two parts, 22 and 18559, that added together give a palindrome (18581).

The spelling of 2218559 in words is "two million, two hundred eighteen thousand, five hundred fifty-nine".