217859 has 2 divisors, whose sum is σ = 217860. Its totient is φ = 217858.

The previous prime is 217849. The next prime is 217901. The reversal of 217859 is 958712.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217859 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (217829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108929 + 108930.

It is an arithmetic number, because the mean of its divisors is an integer number (108930).

2²¹⁷⁸⁵⁹ is an apocalyptic number.

217859 is a deficient number, since it is larger than the sum of its proper divisors (1).

217859 is an equidigital number, since it uses as much as digits as its factorization.

217859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 32.

The square root of 217859 is about 466.7536823636. The cubic root of 217859 is about 60.1716381671.

The spelling of 217859 in words is "two hundred seventeen thousand, eight hundred fifty-nine".