206246009 has 2 divisors, whose sum is σ = 206246010. Its totient is φ = 206246008.

The previous prime is 206245981. The next prime is 206246039. The reversal of 206246009 is 900642602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205836409 + 409600 = 14347^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 206246009 - 2¹² = 206241913 is a prime.

It is not a weakly prime, because it can be changed into another prime (206246039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103123004 + 103123005.

It is an arithmetic number, because the mean of its divisors is an integer number (103123005).

Almost surely, 2^206246009 is an apocalyptic number.

It is an amenable number.

206246009 is a deficient number, since it is larger than the sum of its proper divisors (1).

206246009 is an equidigital number, since it uses as much as digits as its factorization.

206246009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 206246009 is about 14361.2676668879. The cubic root of 206246009 is about 590.8290642774.

The spelling of 206246009 in words is "two hundred six million, two hundred forty-six thousand, nine".