205056869 has 2 divisors, whose sum is σ = 205056870. Its totient is φ = 205056868.

The previous prime is 205056857. The next prime is 205056871. The reversal of 205056869 is 968650502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197739844 + 7317025 = 14062^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 205056869 - 2¹² = 205052773 is a prime.

It is a super-2 number, since 2×205056869² = 84096639048166322, which contains 22 as substring.

Together with 205056871, 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 (205056889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102528434 + 102528435.

It is an arithmetic number, because the mean of its divisors is an integer number (102528435).

Almost surely, 2^205056869 is an apocalyptic number.

It is an amenable number.

205056869 is a deficient number, since it is larger than the sum of its proper divisors (1).

205056869 is an equidigital number, since it uses as much as digits as its factorization.

205056869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 205056869 is about 14319.8068771894. The cubic root of 205056869 is about 589.6913726280.

The spelling of 205056869 in words is "two hundred five million, fifty-six thousand, eight hundred sixty-nine".