285331 has 4 divisors (see below), whose sum is σ = 295200. Its totient is φ = 275464.

The previous prime is 285317. The next prime is 285343. The reversal of 285331 is 133582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133582 = 2 ⋅66791.

It is a cyclic number.

It is not a de Polignac number, because 285331 - 2⁹ = 284819 is a prime.

It is a super-2 number, since 2×285331² = 162827559122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4891 + ... + 4948.

It is an arithmetic number, because the mean of its divisors is an integer number (73800).

2²⁸⁵³³¹ is an apocalyptic number.

285331 is a deficient number, since it is larger than the sum of its proper divisors (9869).

285331 is an equidigital number, since it uses as much as digits as its factorization.

285331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9868.

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

The square root of 285331 is about 534.1638325458. The cubic root of 285331 is about 65.8339105150.

It can be divided in two parts, 285 and 331, that added together give a palindrome (616).

The spelling of 285331 in words is "two hundred eighty-five thousand, three hundred thirty-one".