281885 has 4 divisors (see below), whose sum is σ = 338268. Its totient is φ = 225504.

The previous prime is 281867. The next prime is 281887. The reversal of 281885 is 588182.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40804 + 241081 = 202^2 + 491^2 .

It is a cyclic number.

It is not a de Polignac number, because 281885 - 2¹² = 277789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281885.

It is not an unprimeable number, because it can be changed into a prime (281887) 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, 28184 + ... + 28193.

It is an arithmetic number, because the mean of its divisors is an integer number (84567).

2²⁸¹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

281885 is a deficient number, since it is larger than the sum of its proper divisors (56383).

281885 is an equidigital number, since it uses as much as digits as its factorization.

281885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56382.

The product of its digits is 5120, while the sum is 32.

The square root of 281885 is about 530.9284320885. The cubic root of 281885 is about 65.5678065563.

The spelling of 281885 in words is "two hundred eighty-one thousand, eight hundred eighty-five".