285313 has 4 divisors (see below), whose sum is σ = 326080. Its totient is φ = 244548.

The previous prime is 285301. The next prime is 285317. The reversal of 285313 is 313582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 285313 - 2⁵ = 285281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285317) 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 3 ways as a sum of consecutive naturals, for example, 20373 + ... + 20386.

It is an arithmetic number, because the mean of its divisors is an integer number (81520).

2²⁸⁵³¹³ is an apocalyptic number.

It is an amenable number.

285313 is a deficient number, since it is larger than the sum of its proper divisors (40767).

285313 is an equidigital number, since it uses as much as digits as its factorization.

285313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40766.

The product of its digits is 720, while the sum is 22.

The square root of 285313 is about 534.1469835167. The cubic root of 285313 is about 65.8325261166.

Adding to 285313 its reverse (313582), we get a palindrome (598895).

The spelling of 285313 in words is "two hundred eighty-five thousand, three hundred thirteen".