2218655 has 4 divisors (see below), whose sum is σ = 2662392. Its totient is φ = 1774920.

The previous prime is 2218621. The next prime is 2218663. The reversal of 2218655 is 5568122.

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

It is not a de Polignac number, because 2218655 - 2¹² = 2214559 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2⁴ + 2¹¹ + 1 + 8⁶ + 6⁴ + 5² + 5⁹ .

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221861 + ... + 221870.

It is an arithmetic number, because the mean of its divisors is an integer number (665598).

2^2218655 is an apocalyptic number.

2218655 is a deficient number, since it is larger than the sum of its proper divisors (443737).

2218655 is an equidigital number, since it uses as much as digits as its factorization.

2218655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443736.

The product of its digits is 4800, while the sum is 29.

The square root of 2218655 is about 1489.5150217437. The cubic root of 2218655 is about 130.4257246286.

The spelling of 2218655 in words is "two million, two hundred eighteen thousand, six hundred fifty-five".