285611 has 2 divisors, whose sum is σ = 285612. Its totient is φ = 285610.

The previous prime is 285599. The next prime is 285613. The reversal of 285611 is 116582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285611 - 2¹⁰ = 284587 is a prime.

It is a Sophie Germain prime.

Together with 285613, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2¹⁸ + 8² + 6⁵ + 5⁶ + 1 + 1 .

It is not a weakly prime, because it can be changed into another prime (285613) 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, 142805 + 142806.

It is an arithmetic number, because the mean of its divisors is an integer number (142806).

2²⁸⁵⁶¹¹ is an apocalyptic number.

285611 is a deficient number, since it is larger than the sum of its proper divisors (1).

285611 is an equidigital number, since it uses as much as digits as its factorization.

285611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 23.

The square root of 285611 is about 534.4258601527. The cubic root of 285611 is about 65.8554381075.

The spelling of 285611 in words is "two hundred eighty-five thousand, six hundred eleven".