218013 has 4 divisors (see below), whose sum is σ = 290688. Its totient is φ = 145340.

The previous prime is 218003. The next prime is 218021. The reversal of 218013 is 310812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218013 - 2⁵ = 217981 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 217983 and 218001.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218013.

It is not an unprimeable number, because it can be changed into a prime (218003) by changing a digit.

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, 36333 + ... + 36338.

It is an arithmetic number, because the mean of its divisors is an integer number (72672).

2²¹⁸⁰¹³ is an apocalyptic number.

It is an amenable number.

218013 is a deficient number, since it is larger than the sum of its proper divisors (72675).

218013 is an equidigital number, since it uses as much as digits as its factorization.

218013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72674.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 218013 is about 466.9186224601. The cubic root of 218013 is about 60.1858128546.

Adding to 218013 its reverse (310812), we get a palindrome (528825).

The spelling of 218013 in words is "two hundred eighteen thousand, thirteen".