216543 has 16 divisors (see below), whose sum is σ = 316800. Its totient is φ = 131040.

The previous prime is 216523. The next prime is 216551. The reversal of 216543 is 345612.

It is a happy number.

It is not a de Polignac number, because 216543 - 2¹² = 212447 is a prime.

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

It is a plaindrome in base 16.

It is a nialpdrome in base 13.

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 216543.

It is not an unprimeable number, because it can be changed into a prime (216523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1588 + ... + 1718.

It is an arithmetic number, because the mean of its divisors is an integer number (19800).

2²¹⁶⁵⁴³ is an apocalyptic number.

216543 is a deficient number, since it is larger than the sum of its proper divisors (100257).

216543 is a wasteful number, since it uses less digits than its factorization.

216543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182.

The product of its digits is 720, while the sum is 21.

The square root of 216543 is about 465.3418098559. The cubic root of 216543 is about 60.0502357056.

The spelling of 216543 in words is "two hundred sixteen thousand, five hundred forty-three".