206407609 has 2 divisors, whose sum is σ = 206407610. Its totient is φ = 206407608.

The previous prime is 206407549. The next prime is 206407627. The reversal of 206407609 is 906704602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183873600 + 22534009 = 13560^2 + 4747^2 .

It is a cyclic number.

It is not a de Polignac number, because 206407609 - 2¹⁵ = 206374841 is a prime.

It is not a weakly prime, because it can be changed into another prime (206407709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103203804 + 103203805.

It is an arithmetic number, because the mean of its divisors is an integer number (103203805).

Almost surely, 2^206407609 is an apocalyptic number.

It is an amenable number.

206407609 is a deficient number, since it is larger than the sum of its proper divisors (1).

206407609 is an equidigital number, since it uses as much as digits as its factorization.

206407609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 206407609 is about 14366.8928095117. The cubic root of 206407609 is about 590.9833348198.

The spelling of 206407609 in words is "two hundred six million, four hundred seven thousand, six hundred nine".