281085 has 16 divisors (see below), whose sum is σ = 514176. Its totient is φ = 128448.

The previous prime is 281081. The next prime is 281117. The reversal of 281085 is 580182.

It is not a de Polignac number, because 281085 - 2² = 281081 is a prime.

281085 is a lucky 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 281085.

It is not an unprimeable number, because it can be changed into a prime (281081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1234 + ... + 1443.

It is an arithmetic number, because the mean of its divisors is an integer number (32136).

2²⁸¹⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

281085 is a deficient number, since it is larger than the sum of its proper divisors (233091).

281085 is a wasteful number, since it uses less digits than its factorization.

281085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 281085 is about 530.1744995754. The cubic root of 281085 is about 65.5057198354.

The spelling of 281085 in words is "two hundred eighty-one thousand, eighty-five".