285086881 has 4 divisors (see below), whose sum is σ = 294283264. Its totient is φ = 275890500.

The previous prime is 285086843. The next prime is 285086911. The reversal of 285086881 is 188680582.

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, and also an emirpimes, since its reverse is a distinct semiprime: 188680582 = 2 ⋅94340291.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285086881 is a prime.

It is a super-2 number, since 2×285086881² = 162549059436616322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285086281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4598145 + ... + 4598206.

It is an arithmetic number, because the mean of its divisors is an integer number (73570816).

Almost surely, 2^285086881 is an apocalyptic number.

It is an amenable number.

285086881 is a deficient number, since it is larger than the sum of its proper divisors (9196383).

285086881 is an equidigital number, since it uses as much as digits as its factorization.

285086881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9196382.

The product of its (nonzero) digits is 245760, while the sum is 46.

The square root of 285086881 is about 16884.5160131998. The cubic root of 285086881 is about 658.1513011149.

The spelling of 285086881 in words is "two hundred eighty-five million, eighty-six thousand, eight hundred eighty-one".