216305347 has 2 divisors, whose sum is σ = 216305348. Its totient is φ = 216305346.

The previous prime is 216305281. The next prime is 216305357. The reversal of 216305347 is 743503612.

216305347 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216305347 is a prime.

It is not a weakly prime, because it can be changed into another prime (216305357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108152673 + 108152674.

It is an arithmetic number, because the mean of its divisors is an integer number (108152674).

Almost surely, 2^216305347 is an apocalyptic number.

216305347 is a deficient number, since it is larger than the sum of its proper divisors (1).

216305347 is an equidigital number, since it uses as much as digits as its factorization.

216305347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 216305347 is about 14707.3229039142. The cubic root of 216305347 is about 600.2825955824.

Adding to 216305347 its reverse (743503612), we get a palindrome (959808959).

The spelling of 216305347 in words is "two hundred sixteen million, three hundred five thousand, three hundred forty-seven".