218541 has 8 divisors (see below), whose sum is σ = 294784. Its totient is φ = 144000.

The previous prime is 218531. The next prime is 218549. The reversal of 218541 is 145812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218541 - 2⁵ = 218509 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218549) 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 7 ways as a sum of consecutive naturals, for example, 85 + ... + 666.

It is an arithmetic number, because the mean of its divisors is an integer number (36848).

2²¹⁸⁵⁴¹ is an apocalyptic number.

It is an amenable number.

218541 is a deficient number, since it is larger than the sum of its proper divisors (76243).

218541 is an equidigital number, since it uses as much as digits as its factorization.

218541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

The product of its digits is 320, while the sum is 21.

The square root of 218541 is about 467.4836895550. The cubic root of 218541 is about 60.2343611666.

The spelling of 218541 in words is "two hundred eighteen thousand, five hundred forty-one".