216305143 has 2 divisors, whose sum is σ = 216305144. Its totient is φ = 216305142.

The previous prime is 216305123. The next prime is 216305153. The reversal of 216305143 is 341503612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216305143 - 2¹⁷ = 216174071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216305123) 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 as a sum of consecutive naturals, namely, 108152571 + 108152572.

It is an arithmetic number, because the mean of its divisors is an integer number (108152572).

Almost surely, 2^216305143 is an apocalyptic number.

216305143 is a deficient number, since it is larger than the sum of its proper divisors (1).

216305143 is an equidigital number, since it uses as much as digits as its factorization.

216305143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 216305143 is about 14707.3159685920. The cubic root of 216305143 is about 600.2824068712.

Adding to 216305143 its reverse (341503612), we get a palindrome (557808755).

The spelling of 216305143 in words is "two hundred sixteen million, three hundred five thousand, one hundred forty-three".