205051571 has 2 divisors, whose sum is σ = 205051572. Its totient is φ = 205051570.

The previous prime is 205051559. The next prime is 205051573. The reversal of 205051571 is 175150502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205051571 - 2¹⁸ = 204789427 is a prime.

It is a super-2 number, since 2×205051571² = 84092293539136082, which contains 22 as substring.

Together with 205051573, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205051571.

It is not a weakly prime, because it can be changed into another prime (205051573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102525785 + 102525786.

It is an arithmetic number, because the mean of its divisors is an integer number (102525786).

Almost surely, 2^205051571 is an apocalyptic number.

205051571 is a deficient number, since it is larger than the sum of its proper divisors (1).

205051571 is an equidigital number, since it uses as much as digits as its factorization.

205051571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 205051571 is about 14319.6218874662. The cubic root of 205051571 is about 589.6862940176.

The spelling of 205051571 in words is "two hundred five million, fifty-one thousand, five hundred seventy-one".