206708609 has 2 divisors, whose sum is σ = 206708610. Its totient is φ = 206708608.

The previous prime is 206708599. The next prime is 206708617. The reversal of 206708609 is 906807602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130530625 + 76177984 = 11425^2 + 8728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206708609 is a prime.

It is not a weakly prime, because it can be changed into another prime (206708309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103354304 + 103354305.

It is an arithmetic number, because the mean of its divisors is an integer number (103354305).

Almost surely, 2^206708609 is an apocalyptic number.

It is an amenable number.

206708609 is a deficient number, since it is larger than the sum of its proper divisors (1).

206708609 is an equidigital number, since it uses as much as digits as its factorization.

206708609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 206708609 is about 14377.3644664104. The cubic root of 206708609 is about 591.2704682665.

The spelling of 206708609 in words is "two hundred six million, seven hundred eight thousand, six hundred nine".