216306263 has 2 divisors, whose sum is σ = 216306264. Its totient is φ = 216306262.

The previous prime is 216306247. The next prime is 216306287. The reversal of 216306263 is 362603612.

216306263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216306263 - 2⁴ = 216306247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216306463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108153131 + 108153132.

It is an arithmetic number, because the mean of its divisors is an integer number (108153132).

Almost surely, 2^216306263 is an apocalyptic number.

216306263 is a deficient number, since it is larger than the sum of its proper divisors (1).

216306263 is an equidigital number, since it uses as much as digits as its factorization.

216306263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 216306263 is about 14707.3540448308. The cubic root of 216306263 is about 600.2834429309.

Adding to 216306263 its reverse (362603612), we get a palindrome (578909875).

The spelling of 216306263 in words is "two hundred sixteen million, three hundred six thousand, two hundred sixty-three".