11285 has 8 divisors (see below), whose sum is σ = 14136. Its totient is φ = 8640.

The previous prime is 11279. The next prime is 11287. The reversal of 11285 is 58211.

It can be written as a sum of positive squares in 4 ways, for example, as 676 + 10609 = 26^2 + 103^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-11285 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11287) 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, 155 + ... + 215.

It is an arithmetic number, because the mean of its divisors is an integer number (1767).

2¹¹²⁸⁵ is an apocalyptic number.

It is an amenable number.

11285 is a deficient number, since it is larger than the sum of its proper divisors (2851).

11285 is an equidigital number, since it uses as much as digits as its factorization.

11285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103.

The product of its digits is 80, while the sum is 17.

The square root of 11285 is about 106.2308806327. The cubic root of 11285 is about 22.4302365903.

Adding to 11285 its reverse (58211), we get a palindrome (69496).

The spelling of 11285 in words is "eleven thousand, two hundred eighty-five".