285317 has 2 divisors, whose sum is σ = 285318. Its totient is φ = 285316.

The previous prime is 285301. The next prime is 285343. The reversal of 285317 is 713582.

It is an a-pointer prime, because the next prime (285343) can be obtained adding 285317 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279841 + 5476 = 529^2 + 74^2 .

It is a cyclic number.

It is not a de Polignac number, because 285317 - 2⁴ = 285301 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285317.

It is not a weakly prime, because it can be changed into another prime (285377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142658 + 142659.

It is an arithmetic number, because the mean of its divisors is an integer number (142659).

2²⁸⁵³¹⁷ is an apocalyptic number.

It is an amenable number.

285317 is a deficient number, since it is larger than the sum of its proper divisors (1).

285317 is an equidigital number, since it uses as much as digits as its factorization.

285317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 285317 is about 534.1507277913. The cubic root of 285317 is about 65.8328337657.

Adding to 285317 its reverse (713582), we get a palindrome (998899).

The spelling of 285317 in words is "two hundred eighty-five thousand, three hundred seventeen".