216289 has 2 divisors, whose sum is σ = 216290. Its totient is φ = 216288.

The previous prime is 216263. The next prime is 216317. The reversal of 216289 is 982612.

It is a happy number.

216289 is nontrivially palindromic in base 15.

216289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (216317) can be obtained adding 216289 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216225 + 64 = 465^2 + 8^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216289 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108144 + 108145.

It is an arithmetic number, because the mean of its divisors is an integer number (108145).

2²¹⁶²⁸⁹ is an apocalyptic number.

It is an amenable number.

216289 is a deficient number, since it is larger than the sum of its proper divisors (1).

216289 is an equidigital number, since it uses as much as digits as its factorization.

216289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 216289 is about 465.0688121128. The cubic root of 216289 is about 60.0267473338.

It can be divided in two parts, 216 and 289, that added together give a palindrome (505).

The spelling of 216289 in words is "two hundred sixteen thousand, two hundred eighty-nine".