285568681 has 2 divisors, whose sum is σ = 285568682. Its totient is φ = 285568680.

The previous prime is 285568643. The next prime is 285568687. The reversal of 285568681 is 186865582.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262958656 + 22610025 = 16216^2 + 4755^2 .

It is a cyclic number.

It is not a de Polignac number, because 285568681 - 2¹⁷ = 285437609 is a prime.

It is a super-2 number, since 2×285568681² = 163098943136159522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (285568687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142784340 + 142784341.

It is an arithmetic number, because the mean of its divisors is an integer number (142784341).

Almost surely, 2^285568681 is an apocalyptic number.

It is an amenable number.

285568681 is a deficient number, since it is larger than the sum of its proper divisors (1).

285568681 is an equidigital number, since it uses as much as digits as its factorization.

285568681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 921600, while the sum is 49.

The square root of 285568681 is about 16898.7775001625. Note that the first 3 decimals coincide. The cubic root of 285568681 is about 658.5218534539.

The spelling of 285568681 in words is "two hundred eighty-five million, five hundred sixty-eight thousand, six hundred eighty-one".