285841 has 2 divisors, whose sum is σ = 285842. Its totient is φ = 285840.

The previous prime is 285839. The next prime is 285871. The reversal of 285841 is 148582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271441 + 14400 = 521^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 285841 - 2¹ = 285839 is a prime.

Together with 285839, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (285871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142920 + 142921.

It is an arithmetic number, because the mean of its divisors is an integer number (142921).

2²⁸⁵⁸⁴¹ is an apocalyptic number.

It is an amenable number.

285841 is a deficient number, since it is larger than the sum of its proper divisors (1).

285841 is an equidigital number, since it uses as much as digits as its factorization.

285841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560, while the sum is 28.

The square root of 285841 is about 534.6410010465. The cubic root of 285841 is about 65.8731109641.

The spelling of 285841 in words is "two hundred eighty-five thousand, eight hundred forty-one".