205173025 has 12 divisors (see below), whose sum is σ = 255368700. Its totient is φ = 163522880.

The previous prime is 205173011. The next prime is 205173037. The reversal of 205173025 is 520371502.

205173025 = 10128² + 10129².

It can be written as a sum of positive squares in 6 ways, for example, as 102596641 + 102576384 = 10129^2 + 10128^2 .

It is not a de Polignac number, because 205173025 - 2²³ = 196784417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8530 + ... + 21979.

It is an arithmetic number, because the mean of its divisors is an integer number (21280725).

Almost surely, 2^205173025 is an apocalyptic number.

205173025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

205173025 is the 10129-th centered square number.

It is an amenable number.

205173025 is a deficient number, since it is larger than the sum of its proper divisors (50195675).

205173025 is a wasteful number, since it uses less digits than its factorization.

205173025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30788 (or 30783 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 205173025 is about 14323.8620839493. The cubic root of 205173025 is about 589.8026966428.

It can be divided in two parts, 2051 and 73025, that added together give a square (75076 = 274²).

The spelling of 205173025 in words is "two hundred five million, one hundred seventy-three thousand, twenty-five".