216775443 has 4 divisors (see below), whose sum is σ = 289033928. Its totient is φ = 144516960.

The previous prime is 216775423. The next prime is 216775457. The reversal of 216775443 is 344577612.

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

It is not a de Polignac number, because 216775443 - 2⁸ = 216775187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216775423) 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, 36129238 + ... + 36129243.

It is an arithmetic number, because the mean of its divisors is an integer number (72258482).

Almost surely, 2^216775443 is an apocalyptic number.

216775443 is a deficient number, since it is larger than the sum of its proper divisors (72258485).

216775443 is an equidigital number, since it uses as much as digits as its factorization.

216775443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72258484.

The product of its digits is 141120, while the sum is 39.

The square root of 216775443 is about 14723.2959285616. The cubic root of 216775443 is about 600.7171452740.

The spelling of 216775443 in words is "two hundred sixteen million, seven hundred seventy-five thousand, four hundred forty-three".