206411471309 has 2 divisors, whose sum is σ = 206411471310. Its totient is φ = 206411471308.

The previous prime is 206411471243. The next prime is 206411471311. The reversal of 206411471309 is 903174114602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139369315684 + 67042155625 = 373322^2 + 258925^2 .

It is a cyclic number.

It is not a de Polignac number, because 206411471309 - 2¹⁶ = 206411405773 is a prime.

It is a super-2 number, since 2×206411471309² (a number of 23 digits) contains 22 as substring.

Together with 206411471311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206411477309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103205735654 + 103205735655.

It is an arithmetic number, because the mean of its divisors is an integer number (103205735655).

Almost surely, 2^206411471309 is an apocalyptic number.

It is an amenable number.

206411471309 is a deficient number, since it is larger than the sum of its proper divisors (1).

206411471309 is an equidigital number, since it uses as much as digits as its factorization.

206411471309 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 206411471309 in words is "two hundred six billion, four hundred eleven million, four hundred seventy-one thousand, three hundred nine".