205606571 has 2 divisors, whose sum is σ = 205606572. Its totient is φ = 205606570.

The previous prime is 205606561. The next prime is 205606573. The reversal of 205606571 is 175606502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205606571 - 2⁶ = 205606507 is a prime.

Together with 205606573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205606573) 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, 102803285 + 102803286.

It is an arithmetic number, because the mean of its divisors is an integer number (102803286).

Almost surely, 2^205606571 is an apocalyptic number.

205606571 is a deficient number, since it is larger than the sum of its proper divisors (1).

205606571 is an equidigital number, since it uses as much as digits as its factorization.

205606571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 205606571 is about 14338.9877955175. The cubic root of 205606571 is about 590.2178368266.

The spelling of 205606571 in words is "two hundred five million, six hundred six thousand, five hundred seventy-one".