205005171 has 24 divisors (see below), whose sum is σ = 318962880. Its totient is φ = 116779152.

The previous prime is 205005167. The next prime is 205005239. The reversal of 205005171 is 171500502.

It is not a de Polignac number, because 205005171 - 2² = 205005167 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (205005121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49000 + ... + 53018.

It is an arithmetic number, because the mean of its divisors is an integer number (13290120).

Almost surely, 2^205005171 is an apocalyptic number.

205005171 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

205005171 is a deficient number, since it is larger than the sum of its proper divisors (113957709).

205005171 is a wasteful number, since it uses less digits than its factorization.

205005171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4383 (or 4376 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 205005171 is about 14318.0016412906. The cubic root of 205005171 is about 589.6418116987.

Adding to 205005171 its reverse (171500502), we get a palindrome (376505673).

The spelling of 205005171 in words is "two hundred five million, five thousand, one hundred seventy-one".