216543659 has 2 divisors, whose sum is σ = 216543660. Its totient is φ = 216543658.

The previous prime is 216543631. The next prime is 216543683. The reversal of 216543659 is 956345612.

216543659 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-216543659 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216543619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108271829 + 108271830.

It is an arithmetic number, because the mean of its divisors is an integer number (108271830).

Almost surely, 2^216543659 is an apocalyptic number.

216543659 is a deficient number, since it is larger than the sum of its proper divisors (1).

216543659 is an equidigital number, since it uses as much as digits as its factorization.

216543659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 41.

The square root of 216543659 is about 14715.4224879886. The cubic root of 216543659 is about 600.5029662201.

The spelling of 216543659 in words is "two hundred sixteen million, five hundred forty-three thousand, six hundred fifty-nine".