218115 has 24 divisors (see below), whose sum is σ = 391248. Its totient is φ = 112320.

The previous prime is 218111. The next prime is 218117. The reversal of 218115 is 511812.

It is not a de Polignac number, because 218115 - 2² = 218111 is a prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218115.

It is not an unprimeable number, because it can be changed into a prime (218111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1600 + ... + 1730.

It is an arithmetic number, because the mean of its divisors is an integer number (16302).

2²¹⁸¹¹⁵ is an apocalyptic number.

218115 is a deficient number, since it is larger than the sum of its proper divisors (173133).

218115 is a wasteful number, since it uses less digits than its factorization.

218115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 176 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 218115 is about 467.0278364295. The cubic root of 218115 is about 60.1951976096.

Adding to 218115 its reverse (511812), we get a palindrome (729927).

It can be divided in two parts, 218 and 115, that added together give a palindrome (333).

The spelling of 218115 in words is "two hundred eighteen thousand, one hundred fifteen".