243216443 has 4 divisors (see below), whose sum is σ = 243682008. Its totient is φ = 242750880.

The previous prime is 243216437. The next prime is 243216451. The reversal of 243216443 is 344612342.

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 243216443 - 2²⁰ = 242167867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243215443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231998 + ... + 233043.

It is an arithmetic number, because the mean of its divisors is an integer number (60920502).

Almost surely, 2^243216443 is an apocalyptic number.

243216443 is a deficient number, since it is larger than the sum of its proper divisors (465565).

243216443 is an equidigital number, since it uses as much as digits as its factorization.

243216443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465564.

The product of its digits is 13824, while the sum is 29.

The square root of 243216443 is about 15595.3981353475. The cubic root of 243216443 is about 624.2103674823.

Adding to 243216443 its reverse (344612342), we get a palindrome (587828785).

The spelling of 243216443 in words is "two hundred forty-three million, two hundred sixteen thousand, four hundred forty-three".