285871 has 2 divisors, whose sum is σ = 285872. Its totient is φ = 285870.

The previous prime is 285841. The next prime is 285937. The reversal of 285871 is 178582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 285871 - 2⁵ = 285839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285841) 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 as a sum of consecutive naturals, namely, 142935 + 142936.

It is an arithmetic number, because the mean of its divisors is an integer number (142936).

2²⁸⁵⁸⁷¹ is an apocalyptic number.

285871 is a deficient number, since it is larger than the sum of its proper divisors (1).

285871 is an equidigital number, since it uses as much as digits as its factorization.

285871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 31.

The square root of 285871 is about 534.6690565200. The cubic root of 285871 is about 65.8754154203.

It can be divided in two parts, 285 and 871, that added together give a square (1156 = 34²).

The spelling of 285871 in words is "two hundred eighty-five thousand, eight hundred seventy-one".