205126 has 4 divisors (see below), whose sum is σ = 307692. Its totient is φ = 102562.

The previous prime is 205111. The next prime is 205129. The reversal of 205126 is 621502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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

205126 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 51280 + ... + 51283.

It is an arithmetic number, because the mean of its divisors is an integer number (76923).

2²⁰⁵¹²⁶ is an apocalyptic number.

205126 is a deficient number, since it is larger than the sum of its proper divisors (102566).

205126 is a wasteful number, since it uses less digits than its factorization.

205126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102565.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 205126 is about 452.9083792557. The cubic root of 205126 is about 58.9757632904.

Adding to 205126 its reverse (621502), we get a palindrome (826628).

The spelling of 205126 in words is "two hundred five thousand, one hundred twenty-six".