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205123 = 415003
BaseRepresentation
bin110010000101000011
3101102101011
4302011003
523030443
64221351
71513012
oct620503
9342334
10205123
11130126
129a857
1372499
1454a79
1540b9d
hex32143

205123 has 4 divisors (see below), whose sum is σ = 210168. Its totient is φ = 200080.

The previous prime is 205111. The next prime is 205129. The reversal of 205123 is 321502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321502 = 2160751.

It is not a de Polignac number, because 205123 - 217 = 74051 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2461 + ... + 2542.

It is an arithmetic number, because the mean of its divisors is an integer number (52542).

2205123 is an apocalyptic number.

205123 is a deficient number, since it is larger than the sum of its proper divisors (5045).

205123 is an equidigital number, since it uses as much as digits as its factorization.

205123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5044.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 205123 is about 452.9050673154. The cubic root of 205123 is about 58.9754757790.

Adding to 205123 its reverse (321502), we get a palindrome (526625).

The spelling of 205123 in words is "two hundred five thousand, one hundred twenty-three".

Divisors: 1 41 5003 205123