2218090345 has 4 divisors (see below), whose sum is σ = 2661708420. Its totient is φ = 1774472272.

The previous prime is 2218090337. The next prime is 2218090349. The reversal of 2218090345 is 5430908122.

2218090345 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 263477824 + 1954612521 = 16232^2 + 44211^2 .

It is a cyclic number.

It is not a de Polignac number, because 2218090345 - 2³ = 2218090337 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2218090345.

It is not an unprimeable number, because it can be changed into a prime (2218090349) 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, 221809030 + ... + 221809039.

It is an arithmetic number, because the mean of its divisors is an integer number (665427105).

Almost surely, 2^2218090345 is an apocalyptic number.

It is an amenable number.

2218090345 is a deficient number, since it is larger than the sum of its proper divisors (443618075).

2218090345 is an equidigital number, since it uses as much as digits as its factorization.

2218090345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443618074.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 2218090345 is about 47096.6065125716. The cubic root of 2218090345 is about 1304.1465909778.

Adding to 2218090345 its reverse (5430908122), we get a palindrome (7648998467).

The spelling of 2218090345 in words is "two billion, two hundred eighteen million, ninety thousand, three hundred forty-five".