206568389 has 2 divisors, whose sum is σ = 206568390. Its totient is φ = 206568388.

The previous prime is 206568379. The next prime is 206568403. The reversal of 206568389 is 983865602.

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., 135722500 + 70845889 = 11650^2 + 8417^2 .

It is a cyclic number.

It is not a de Polignac number, because 206568389 - 2¹⁶ = 206502853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206568379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103284194 + 103284195.

It is an arithmetic number, because the mean of its divisors is an integer number (103284195).

Almost surely, 2^206568389 is an apocalyptic number.

It is an amenable number.

206568389 is a deficient number, since it is larger than the sum of its proper divisors (1).

206568389 is an equidigital number, since it uses as much as digits as its factorization.

206568389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 206568389 is about 14372.4872238593. The cubic root of 206568389 is about 591.1367426656.

The spelling of 206568389 in words is "two hundred six million, five hundred sixty-eight thousand, three hundred eighty-nine".