205500173 has 2 divisors, whose sum is σ = 205500174. Its totient is φ = 205500172.

The previous prime is 205500161. The next prime is 205500179. The reversal of 205500173 is 371005502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181656484 + 23843689 = 13478^2 + 4883^2 .

It is a cyclic number.

It is not a de Polignac number, because 205500173 - 2⁴ = 205500157 is a prime.

It is a super-2 number, since 2×205500173² = 84460642206059858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205500179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102750086 + 102750087.

It is an arithmetic number, because the mean of its divisors is an integer number (102750087).

Almost surely, 2^205500173 is an apocalyptic number.

It is an amenable number.

205500173 is a deficient number, since it is larger than the sum of its proper divisors (1).

205500173 is an equidigital number, since it uses as much as digits as its factorization.

205500173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 205500173 is about 14335.2772208981. The cubic root of 205500173 is about 590.1160099370.

Adding to 205500173 its reverse (371005502), we get a palindrome (576505675).

The spelling of 205500173 in words is "two hundred five million, five hundred thousand, one hundred seventy-three".