218411 has 4 divisors (see below), whose sum is σ = 224352. Its totient is φ = 212472.

The previous prime is 218401. The next prime is 218417. The reversal of 218411 is 114812.

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

It is a cyclic number.

It is not a de Polignac number, because 218411 - 2¹⁰ = 217387 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 218411.

It is not an unprimeable number, because it can be changed into a prime (218417) 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, 2915 + ... + 2988.

It is an arithmetic number, because the mean of its divisors is an integer number (56088).

2²¹⁸⁴¹¹ is an apocalyptic number.

218411 is a deficient number, since it is larger than the sum of its proper divisors (5941).

218411 is an equidigital number, since it uses as much as digits as its factorization.

218411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5940.

The product of its digits is 64, while the sum is 17.

The square root of 218411 is about 467.3446265873. The cubic root of 218411 is about 60.2224152463. Note that the first 3 decimals are identical.

It can be divided in two parts, 218 and 411, that multiplied together give a palindrome (89598).

The spelling of 218411 in words is "two hundred eighteen thousand, four hundred eleven".