13218145 has 4 divisors (see below), whose sum is σ = 15861780. Its totient is φ = 10574512.

The previous prime is 13218131. The next prime is 13218181. The reversal of 13218145 is 54181231.

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 8958049 + 4260096 = 2993^2 + 2064^2 .

It is a cyclic number.

It is not a de Polignac number, because 13218145 - 2¹¹ = 13216097 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1321810 + ... + 1321819.

It is an arithmetic number, because the mean of its divisors is an integer number (3965445).

Almost surely, 2^13218145 is an apocalyptic number.

It is an amenable number.

13218145 is a deficient number, since it is larger than the sum of its proper divisors (2643635).

13218145 is an equidigital number, since it uses as much as digits as its factorization.

13218145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643634.

The product of its digits is 960, while the sum is 25.

The square root of 13218145 is about 3635.6766907964. The cubic root of 13218145 is about 236.4413900327.

Adding to 13218145 its reverse (54181231), we get a palindrome (67399376).

The spelling of 13218145 in words is "thirteen million, two hundred eighteen thousand, one hundred forty-five".