206642297 has 2 divisors, whose sum is σ = 206642298. Its totient is φ = 206642296.

The previous prime is 206642279. The next prime is 206642351. The reversal of 206642297 is 792246602.

It is a happy number.

Together with previous prime (206642279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142945936 + 63696361 = 11956^2 + 7981^2 .

It is a cyclic number.

It is not a de Polignac number, because 206642297 - 2⁸ = 206642041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206642297.

It is not a weakly prime, because it can be changed into another prime (206642237) 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, 103321148 + 103321149.

It is an arithmetic number, because the mean of its divisors is an integer number (103321149).

Almost surely, 2^206642297 is an apocalyptic number.

It is an amenable number.

206642297 is a deficient number, since it is larger than the sum of its proper divisors (1).

206642297 is an equidigital number, since it uses as much as digits as its factorization.

206642297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 206642297 is about 14375.0581564041. The cubic root of 206642297 is about 591.2072350983.

Adding to 206642297 its reverse (792246602), we get a palindrome (998888899).

The spelling of 206642297 in words is "two hundred six million, six hundred forty-two thousand, two hundred ninety-seven".