285559 has 2 divisors, whose sum is σ = 285560. Its totient is φ = 285558.

The previous prime is 285557. The next prime is 285569. The reversal of 285559 is 955582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 285559 - 2¹ = 285557 is a prime.

Together with 285557, it forms a pair of twin primes.

285559 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142779 + 142780.

It is an arithmetic number, because the mean of its divisors is an integer number (142780).

2²⁸⁵⁵⁵⁹ is an apocalyptic number.

285559 is a deficient number, since it is larger than the sum of its proper divisors (1).

285559 is an equidigital number, since it uses as much as digits as its factorization.

285559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 34.

The square root of 285559 is about 534.3772075978. The cubic root of 285559 is about 65.8514411902.

The spelling of 285559 in words is "two hundred eighty-five thousand, five hundred fifty-nine".