206317 has 4 divisors (see below), whose sum is σ = 207580. Its totient is φ = 205056.

The previous prime is 206303. The next prime is 206341. The reversal of 206317 is 713602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72361 + 133956 = 269^2 + 366^2 .

It is a cyclic number.

It is not a de Polignac number, because 206317 - 2¹⁵ = 173549 is a prime.

It is a Duffinian number.

206317 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 206294 and 206303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206347) 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 in 3 ways as a sum of consecutive naturals, for example, 342 + ... + 727.

It is an arithmetic number, because the mean of its divisors is an integer number (51895).

2²⁰⁶³¹⁷ is an apocalyptic number.

It is an amenable number.

206317 is a deficient number, since it is larger than the sum of its proper divisors (1263).

206317 is a wasteful number, since it uses less digits than its factorization.

206317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 206317 is about 454.2213116973. The cubic root of 206317 is about 59.0896845362.

Adding to 206317 its reverse (713602), we get a palindrome (919919).

It can be divided in two parts, 2063 and 17, that added together give a triangular number (2080 = T₆₄).

The spelling of 206317 in words is "two hundred six thousand, three hundred seventeen".