218113 has 4 divisors (see below), whose sum is σ = 249280. Its totient is φ = 186948.

The previous prime is 218111. The next prime is 218117. The reversal of 218113 is 311812.

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 218113 - 2¹ = 218111 is a prime.

It is an Ulam number.

It is a Duffinian number.

218113 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (218111) 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, 15573 + ... + 15586.

It is an arithmetic number, because the mean of its divisors is an integer number (62320).

It is a Proth number, since it is equal to 213 ⋅ 2¹⁰ + 1 and 213 < 2¹⁰.

2²¹⁸¹¹³ is an apocalyptic number.

It is an amenable number.

218113 is a deficient number, since it is larger than the sum of its proper divisors (31167).

218113 is an equidigital number, since it uses as much as digits as its factorization.

218113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31166.

The product of its digits is 48, while the sum is 16.

The square root of 218113 is about 467.0256952246. The cubic root of 218113 is about 60.1950136229.

Adding to 218113 its reverse (311812), we get a palindrome (529925).

The spelling of 218113 in words is "two hundred eighteen thousand, one hundred thirteen".