285211 has 4 divisors (see below), whose sum is σ = 289192. Its totient is φ = 281232.

The previous prime is 285199. The next prime is 285221. The reversal of 285211 is 112582.

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

It is a cyclic number.

It is not a de Polignac number, because 285211 - 2⁵ = 285179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285221) 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, 1881 + ... + 2026.

It is an arithmetic number, because the mean of its divisors is an integer number (72298).

2²⁸⁵²¹¹ is an apocalyptic number.

285211 is a deficient number, since it is larger than the sum of its proper divisors (3981).

285211 is an equidigital number, since it uses as much as digits as its factorization.

285211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3980.

The product of its digits is 160, while the sum is 19.

The square root of 285211 is about 534.0514956444. The cubic root of 285211 is about 65.8246800925.

Adding to 285211 its reverse (112582), we get a palindrome (397793).

It can be divided in two parts, 285 and 211, that added together give a triangular number (496 = T₃₁).

The spelling of 285211 in words is "two hundred eighty-five thousand, two hundred eleven".