285855281 has 4 divisors (see below), whose sum is σ = 285937392. Its totient is φ = 285773172.

The previous prime is 285855263. The next prime is 285855287. The reversal of 285855281 is 182558582.

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 a de Polignac number, because none of the positive numbers 2^k-285855281 is a prime.

It is a super-2 number, since 2×285855281² = 163426483351177922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285855287) 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, 35591 + ... + 42876.

It is an arithmetic number, because the mean of its divisors is an integer number (71484348).

Almost surely, 2^285855281 is an apocalyptic number.

It is an amenable number.

285855281 is a deficient number, since it is larger than the sum of its proper divisors (82111).

285855281 is an equidigital number, since it uses as much as digits as its factorization.

285855281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82110.

The product of its digits is 256000, while the sum is 44.

The square root of 285855281 is about 16907.2552769514. The cubic root of 285855281 is about 658.7420798220.

The spelling of 285855281 in words is "two hundred eighty-five million, eight hundred fifty-five thousand, two hundred eighty-one".