283868821 has 2 divisors, whose sum is σ = 283868822. Its totient is φ = 283868820.

The previous prime is 283868803. The next prime is 283868857. The reversal of 283868821 is 128868382.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239166225 + 44702596 = 15465^2 + 6686^2 .

It is a cyclic number.

It is not a de Polignac number, because 283868821 - 2¹⁹ = 283344533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (283868801) 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, 141934410 + 141934411.

It is an arithmetic number, because the mean of its divisors is an integer number (141934411).

Almost surely, 2^283868821 is an apocalyptic number.

It is an amenable number.

283868821 is a deficient number, since it is larger than the sum of its proper divisors (1).

283868821 is an equidigital number, since it uses as much as digits as its factorization.

283868821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 294912, while the sum is 46.

The square root of 283868821 is about 16848.4070760413. The cubic root of 283868821 is about 657.2126255995.

The spelling of 283868821 in words is "two hundred eighty-three million, eight hundred sixty-eight thousand, eight hundred twenty-one".