206022281 has 2 divisors, whose sum is σ = 206022282. Its totient is φ = 206022280.

The previous prime is 206022239. The next prime is 206022287. The reversal of 206022281 is 182220602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114169225 + 91853056 = 10685^2 + 9584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206022281 is a prime.

It is a super-2 number, since 2×206022281² = 84890360536885922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206022287) 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, 103011140 + 103011141.

It is an arithmetic number, because the mean of its divisors is an integer number (103011141).

Almost surely, 2^206022281 is an apocalyptic number.

It is an amenable number.

206022281 is a deficient number, since it is larger than the sum of its proper divisors (1).

206022281 is an equidigital number, since it uses as much as digits as its factorization.

206022281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 206022281 is about 14353.4762688347. The cubic root of 206022281 is about 590.6153505175.

Adding to 206022281 its reverse (182220602), we get a palindrome (388242883).

The spelling of 206022281 in words is "two hundred six million, twenty-two thousand, two hundred eighty-one".