216965347 has 2 divisors, whose sum is σ = 216965348. Its totient is φ = 216965346.

The previous prime is 216965303. The next prime is 216965377. The reversal of 216965347 is 743569612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216965347 is a prime.

It is not a weakly prime, because it can be changed into another prime (216965377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108482673 + 108482674.

It is an arithmetic number, because the mean of its divisors is an integer number (108482674).

Almost surely, 2^216965347 is an apocalyptic number.

216965347 is a deficient number, since it is larger than the sum of its proper divisors (1).

216965347 is an equidigital number, since it uses as much as digits as its factorization.

216965347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 216965347 is about 14729.7436162345. The cubic root of 216965347 is about 600.8925115285.

The spelling of 216965347 in words is "two hundred sixteen million, nine hundred sixty-five thousand, three hundred forty-seven".