284868209 has 2 divisors, whose sum is σ = 284868210. Its totient is φ = 284868208.

The previous prime is 284868169. The next prime is 284868211. The reversal of 284868209 is 902868482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161213809 + 123654400 = 12697^2 + 11120^2 .

It is a cyclic number.

It is not a de Polignac number, because 284868209 - 2⁸ = 284867953 is a prime.

It is a super-2 number, since 2×284868209² = 162299792997735362, which contains 22 as substring.

Together with 284868211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (284868289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142434104 + 142434105.

It is an arithmetic number, because the mean of its divisors is an integer number (142434105).

Almost surely, 2^284868209 is an apocalyptic number.

It is an amenable number.

284868209 is a deficient number, since it is larger than the sum of its proper divisors (1).

284868209 is an equidigital number, since it uses as much as digits as its factorization.

284868209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 442368, while the sum is 47.

The square root of 284868209 is about 16878.0392522354. The cubic root of 284868209 is about 657.9829827487.

The spelling of 284868209 in words is "two hundred eighty-four million, eight hundred sixty-eight thousand, two hundred nine".