205616069 has 2 divisors, whose sum is σ = 205616070. Its totient is φ = 205616068.

The previous prime is 205616063. The next prime is 205616083. The reversal of 205616069 is 960616502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181899169 + 23716900 = 13487^2 + 4870^2 .

It is a cyclic number.

It is not a de Polignac number, because 205616069 - 2⁴ = 205616053 is a prime.

It is a super-2 number, since 2×205616069² = 84555935662025522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205616063) 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, 102808034 + 102808035.

It is an arithmetic number, because the mean of its divisors is an integer number (102808035).

Almost surely, 2^205616069 is an apocalyptic number.

It is an amenable number.

205616069 is a deficient number, since it is larger than the sum of its proper divisors (1).

205616069 is an equidigital number, since it uses as much as digits as its factorization.

205616069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 205616069 is about 14339.3189866186. The cubic root of 205616069 is about 590.2269250619.

The spelling of 205616069 in words is "two hundred five million, six hundred sixteen thousand, sixty-nine".