216303947 has 2 divisors, whose sum is σ = 216303948. Its totient is φ = 216303946.

The previous prime is 216303943. The next prime is 216303949. The reversal of 216303947 is 749303612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216303947 - 2² = 216303943 is a prime.

Together with 216303949, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216303943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108151973 + 108151974.

It is an arithmetic number, because the mean of its divisors is an integer number (108151974).

Almost surely, 2^216303947 is an apocalyptic number.

216303947 is a deficient number, since it is larger than the sum of its proper divisors (1).

216303947 is an equidigital number, since it uses as much as digits as its factorization.

216303947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 216303947 is about 14707.2753084995. The cubic root of 216303947 is about 600.2813005035.

The spelling of 216303947 in words is "two hundred sixteen million, three hundred three thousand, nine hundred forty-seven".