206491169 has 2 divisors, whose sum is σ = 206491170. Its totient is φ = 206491168.

The previous prime is 206491151. The next prime is 206491177. The reversal of 206491169 is 961194602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142683025 + 63808144 = 11945^2 + 7988^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206491169 is a prime.

It is a super-2 number, since 2×206491169² = 85277205749973122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206491139) 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, 103245584 + 103245585.

It is an arithmetic number, because the mean of its divisors is an integer number (103245585).

Almost surely, 2^206491169 is an apocalyptic number.

It is an amenable number.

206491169 is a deficient number, since it is larger than the sum of its proper divisors (1).

206491169 is an equidigital number, since it uses as much as digits as its factorization.

206491169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 206491169 is about 14369.8005901265. The cubic root of 206491169 is about 591.0630733290.

The spelling of 206491169 in words is "two hundred six million, four hundred ninety-one thousand, one hundred sixty-nine".