12218545 has 8 divisors (see below), whose sum is σ = 14694120. Its totient is φ = 9753600.

The previous prime is 12218537. The next prime is 12218587. The reversal of 12218545 is 54581221.

12218545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3122289 + 9096256 = 1767^2 + 3016^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12218545 - 2³ = 12218537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145 + ... + 4945.

It is an arithmetic number, because the mean of its divisors is an integer number (1836765).

Almost surely, 2^12218545 is an apocalyptic number.

It is an amenable number.

12218545 is a deficient number, since it is larger than the sum of its proper divisors (2475575).

12218545 is an equidigital number, since it uses as much as digits as its factorization.

12218545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5315.

The product of its digits is 3200, while the sum is 28.

The square root of 12218545 is about 3495.5035402643. The cubic root of 12218545 is about 230.3243376270.

Adding to 12218545 its reverse (54581221), we get a palindrome (66799766).

The spelling of 12218545 in words is "twelve million, two hundred eighteen thousand, five hundred forty-five".