12218559 has 4 divisors (see below), whose sum is σ = 16291416. Its totient is φ = 8145704.

The previous prime is 12218537. The next prime is 12218587. The reversal of 12218559 is 95581221.

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

It is a cyclic number.

It is not a de Polignac number, because 12218559 - 2⁵ = 12218527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218509) 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, 2036424 + ... + 2036429.

It is an arithmetic number, because the mean of its divisors is an integer number (4072854).

Almost surely, 2^12218559 is an apocalyptic number.

12218559 is a deficient number, since it is larger than the sum of its proper divisors (4072857).

12218559 is an equidigital number, since it uses as much as digits as its factorization.

12218559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4072856.

The product of its digits is 7200, while the sum is 33.

The square root of 12218559 is about 3495.5055428364. The cubic root of 12218559 is about 230.3244255954.

It can be divided in two parts, 122 and 18559, that added together give a palindrome (18681).

The spelling of 12218559 in words is "twelve million, two hundred eighteen thousand, five hundred fifty-nine".