216871943 has 4 divisors (see below), whose sum is σ = 217140168. Its totient is φ = 216603720.

The previous prime is 216871937. The next prime is 216871951. The reversal of 216871943 is 349178612.

216871943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216871943 - 2¹⁰ = 216870919 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 216871943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216871903) 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, 132896 + ... + 134517.

It is an arithmetic number, because the mean of its divisors is an integer number (54285042).

Almost surely, 2^216871943 is an apocalyptic number.

216871943 is a deficient number, since it is larger than the sum of its proper divisors (268225).

216871943 is an equidigital number, since it uses as much as digits as its factorization.

216871943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268224.

The product of its digits is 72576, while the sum is 41.

The square root of 216871943 is about 14726.5726834182. The cubic root of 216871943 is about 600.8062706903.

The spelling of 216871943 in words is "two hundred sixteen million, eight hundred seventy-one thousand, nine hundred forty-three".