216303611 has 2 divisors, whose sum is σ = 216303612. Its totient is φ = 216303610.

The previous prime is 216303601. The next prime is 216303623. The reversal of 216303611 is 116303612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216303611 - 2¹⁸ = 216041467 is a prime.

It is a Chen prime.

It is equal to p_11930261 and since 216303611 and 11930261 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (216303601) 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, 108151805 + 108151806.

It is an arithmetic number, because the mean of its divisors is an integer number (108151806).

Almost surely, 2^216303611 is an apocalyptic number.

216303611 is a deficient number, since it is larger than the sum of its proper divisors (1).

216303611 is an equidigital number, since it uses as much as digits as its factorization.

216303611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 216303611 is about 14707.2638855771. The cubic root of 216303611 is about 600.2809896838.

Subtracting from 216303611 its reverse (116303612), we obtain a palindrome (99999999).

The spelling of 216303611 in words is "two hundred sixteen million, three hundred three thousand, six hundred eleven".