12218917 has 4 divisors (see below), whose sum is σ = 12549196. Its totient is φ = 11888640.

The previous prime is 12218897. The next prime is 12218933. The reversal of 12218917 is 71981221.

12218917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10439361 + 1779556 = 3231^2 + 1334^2 .

It is a cyclic number.

It is not a de Polignac number, because 12218917 - 2¹⁵ = 12186149 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 (12218977) 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, 165084 + ... + 165157.

It is an arithmetic number, because the mean of its divisors is an integer number (3137299).

Almost surely, 2^12218917 is an apocalyptic number.

It is an amenable number.

12218917 is a deficient number, since it is larger than the sum of its proper divisors (330279).

12218917 is an equidigital number, since it uses as much as digits as its factorization.

12218917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330278.

The product of its digits is 2016, while the sum is 31.

The square root of 12218917 is about 3495.5567510770. The cubic root of 12218917 is about 230.3266750516.

The spelling of 12218917 in words is "twelve million, two hundred eighteen thousand, nine hundred seventeen".