218516 has 6 divisors (see below), whose sum is σ = 382410. Its totient is φ = 109256.

The previous prime is 218513. The next prime is 218521. The reversal of 218516 is 615812.

218516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 198916 + 19600 = 446^2 + 140^2 .

It is a junction number, because it is equal to n+sod(n) for n = 218491 and 218500.

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 218516.

It is not an unprimeable number, because it can be changed into a prime (218513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27311 + ... + 27318.

It is an arithmetic number, because the mean of its divisors is an integer number (63735).

2²¹⁸⁵¹⁶ is an apocalyptic number.

It is an amenable number.

218516 is a deficient number, since it is larger than the sum of its proper divisors (163894).

218516 is a wasteful number, since it uses less digits than its factorization.

218516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54633 (or 54631 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 218516 is about 467.4569498895. The cubic root of 218516 is about 60.2320642422.

The spelling of 218516 in words is "two hundred eighteen thousand, five hundred sixteen".