216803 has 2 divisors, whose sum is σ = 216804. Its totient is φ = 216802.

The previous prime is 216791. The next prime is 216829. The reversal of 216803 is 308612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216803 - 2⁴ = 216787 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (216103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108401 + 108402.

It is an arithmetic number, because the mean of its divisors is an integer number (108402).

2²¹⁶⁸⁰³ is an apocalyptic number.

216803 is a deficient number, since it is larger than the sum of its proper divisors (1).

216803 is an equidigital number, since it uses as much as digits as its factorization.

216803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 216803 is about 465.6210905876. The cubic root of 216803 is about 60.0742599050.

Subtracting 216803 from its reverse (308612), we obtain a square (91809 = 303²).

The spelling of 216803 in words is "two hundred sixteen thousand, eight hundred three".