285081 has 4 divisors (see below), whose sum is σ = 380112. Its totient is φ = 190052.

The previous prime is 285079. The next prime is 285091. The reversal of 285081 is 180582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 285081 - 2¹ = 285079 is a prime.

It is a super-2 number, since 2×285081² = 162542353122, which contains 22 as substring.

It is a D-number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285081.

It is not an unprimeable number, because it can be changed into a prime (285031) 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, 47511 + ... + 47516.

It is an arithmetic number, because the mean of its divisors is an integer number (95028).

2²⁸⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

285081 is a deficient number, since it is larger than the sum of its proper divisors (95031).

285081 is an equidigital number, since it uses as much as digits as its factorization.

285081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95030.

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

The square root of 285081 is about 533.9297706628. The cubic root of 285081 is about 65.8146775460.

The spelling of 285081 in words is "two hundred eighty-five thousand, eighty-one".