216543983 has 4 divisors (see below), whose sum is σ = 220214280. Its totient is φ = 212873688.

The previous prime is 216543947. The next prime is 216543989. The reversal of 216543983 is 389345612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216543983 - 2²⁴ = 199766767 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216543983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216543989) 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, 1835060 + ... + 1835177.

It is an arithmetic number, because the mean of its divisors is an integer number (55053570).

Almost surely, 2^216543983 is an apocalyptic number.

216543983 is a deficient number, since it is larger than the sum of its proper divisors (3670297).

216543983 is an equidigital number, since it uses as much as digits as its factorization.

216543983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3670296.

The product of its digits is 155520, while the sum is 41.

The square root of 216543983 is about 14715.4334968427. The cubic root of 216543983 is about 600.5032657176.

The spelling of 216543983 in words is "two hundred sixteen million, five hundred forty-three thousand, nine hundred eighty-three".