285311 has 8 divisors (see below), whose sum is σ = 325584. Its totient is φ = 247680.

The previous prime is 285301. The next prime is 285317. The reversal of 285311 is 113582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 285311 - 2¹⁴ = 268927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425 + ... + 866.

It is an arithmetic number, because the mean of its divisors is an integer number (40698).

2²⁸⁵³¹¹ is an apocalyptic number.

285311 is a deficient number, since it is larger than the sum of its proper divisors (40273).

285311 is a wasteful number, since it uses less digits than its factorization.

285311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321.

The product of its digits is 240, while the sum is 20.

The square root of 285311 is about 534.1451113696. The cubic root of 285311 is about 65.8323722910.

Adding to 285311 its reverse (113582), we get a palindrome (398893).

The spelling of 285311 in words is "two hundred eighty-five thousand, three hundred eleven".