168217 has 6 divisors (see below), whose sum is σ = 195738. Its totient is φ = 144144.

The previous prime is 168211. The next prime is 168227. The reversal of 168217 is 712861.

It can be written as a sum of positive squares in only one way, i.e., 132496 + 35721 = 364^2 + 189^2 .

It is not a de Polignac number, because 168217 - 2⁷ = 168089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168191 and 168200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1668 + ... + 1765.

It is an arithmetic number, because the mean of its divisors is an integer number (32623).

2¹⁶⁸²¹⁷ is an apocalyptic number.

It is an amenable number.

168217 is a deficient number, since it is larger than the sum of its proper divisors (27521).

168217 is an equidigital number, since it uses as much as digits as its factorization.

168217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447 (or 3440 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 168217 is about 410.1426581081. The cubic root of 168217 is about 55.2022307087.

Subtracting 168217 from its reverse (712861), we obtain a square (544644 = 738²).

The spelling of 168217 in words is "one hundred sixty-eight thousand, two hundred seventeen".