206345389 has 2 divisors, whose sum is σ = 206345390. Its totient is φ = 206345388.

The previous prime is 206345311. The next prime is 206345407. The reversal of 206345389 is 983543602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204976489 + 1368900 = 14317^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 206345389 - 2¹¹ = 206343341 is a prime.

It is a super-2 number, since 2×206345389² = 85156839123122642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206745389) 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, 103172694 + 103172695.

It is an arithmetic number, because the mean of its divisors is an integer number (103172695).

Almost surely, 2^206345389 is an apocalyptic number.

It is an amenable number.

206345389 is a deficient number, since it is larger than the sum of its proper divisors (1).

206345389 is an equidigital number, since it uses as much as digits as its factorization.

206345389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 206345389 is about 14364.7272511524. The cubic root of 206345389 is about 590.9239463785.

The spelling of 206345389 in words is "two hundred six million, three hundred forty-five thousand, three hundred eighty-nine".