205434571 has 2 divisors, whose sum is σ = 205434572. Its totient is φ = 205434570.

The previous prime is 205434553. The next prime is 205434587. The reversal of 205434571 is 175434502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205434571 - 2⁵ = 205434539 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205434871) 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, 102717285 + 102717286.

It is an arithmetic number, because the mean of its divisors is an integer number (102717286).

Almost surely, 2^205434571 is an apocalyptic number.

205434571 is a deficient number, since it is larger than the sum of its proper divisors (1).

205434571 is an equidigital number, since it uses as much as digits as its factorization.

205434571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 205434571 is about 14332.9889067145. The cubic root of 205434571 is about 590.0532088372.

The spelling of 205434571 in words is "two hundred five million, four hundred thirty-four thousand, five hundred seventy-one".