205261571 has 4 divisors (see below), whose sum is σ = 211882944. Its totient is φ = 198640200.

The previous prime is 205261561. The next prime is 205261577. The reversal of 205261571 is 175162502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205261571 - 2¹⁸ = 204999427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205261577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3310640 + ... + 3310701.

It is an arithmetic number, because the mean of its divisors is an integer number (52970736).

Almost surely, 2^205261571 is an apocalyptic number.

205261571 is a deficient number, since it is larger than the sum of its proper divisors (6621373).

205261571 is an equidigital number, since it uses as much as digits as its factorization.

205261571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6621372.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 205261571 is about 14326.9526068875. The cubic root of 205261571 is about 589.8875309894.

The spelling of 205261571 in words is "two hundred five million, two hundred sixty-one thousand, five hundred seventy-one".