216899 has 2 divisors, whose sum is σ = 216900. Its totient is φ = 216898.

The previous prime is 216877. The next prime is 216901. The reversal of 216899 is 998612.

216899 is nontrivially palindromic in base 16.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216899 is a prime.

Together with 216901, 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 (216829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108449 + 108450.

It is an arithmetic number, because the mean of its divisors is an integer number (108450).

2²¹⁶⁸⁹⁹ is an apocalyptic number.

216899 is a deficient number, since it is larger than the sum of its proper divisors (1).

216899 is an equidigital number, since it uses as much as digits as its factorization.

216899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 216899 is about 465.7241672922. The cubic root of 216899 is about 60.0831255233.

The spelling of 216899 in words is "two hundred sixteen thousand, eight hundred ninety-nine".