216859 has 2 divisors, whose sum is σ = 216860. Its totient is φ = 216858.

The previous prime is 216851. The next prime is 216877. The reversal of 216859 is 958612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216859 - 2³ = 216851 is a prime.

It is a super-3 number, since 3×216859³ = 30595221878183337, which contains 333 as substring.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 216859.

It is not a weakly prime, because it can be changed into another prime (216851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108429 + 108430.

It is an arithmetic number, because the mean of its divisors is an integer number (108430).

2²¹⁶⁸⁵⁹ is an apocalyptic number.

216859 is a deficient number, since it is larger than the sum of its proper divisors (1).

216859 is an equidigital number, since it uses as much as digits as its factorization.

216859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 216859 is about 465.6812214380. The cubic root of 216859 is about 60.0794318337.

It can be divided in two parts, 2 and 16859, that added together give a palindrome (16861).

The spelling of 216859 in words is "two hundred sixteen thousand, eight hundred fifty-nine".