204605171 has 4 divisors (see below), whose sum is σ = 213501072. Its totient is φ = 195709272.

The previous prime is 204605131. The next prime is 204605189. The reversal of 204605171 is 171506402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171506402 = 2 ⋅85753201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204605171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204605171.

It is not an unprimeable number, because it can be changed into a prime (204605131) 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 in 3 ways as a sum of consecutive naturals, for example, 4447916 + ... + 4447961.

It is an arithmetic number, because the mean of its divisors is an integer number (53375268).

Almost surely, 2^204605171 is an apocalyptic number.

204605171 is a deficient number, since it is larger than the sum of its proper divisors (8895901).

204605171 is an equidigital number, since it uses as much as digits as its factorization.

204605171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8895900.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 204605171 is about 14304.0263911949. The cubic root of 204605171 is about 589.2580648093.

The spelling of 204605171 in words is "two hundred four million, six hundred five thousand, one hundred seventy-one".