205121894 has 16 divisors (see below), whose sum is σ = 315515520. Its totient is φ = 99980160.

The previous prime is 205121879. The next prime is 205121899. The reversal of 205121894 is 498121502.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 205121894.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205121899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6347 + ... + 21225.

It is an arithmetic number, because the mean of its divisors is an integer number (19719720).

Almost surely, 2^205121894 is an apocalyptic number.

205121894 is a deficient number, since it is larger than the sum of its proper divisors (110393626).

205121894 is a wasteful number, since it uses less digits than its factorization.

205121894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15055.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 205121894 is about 14322.0771538209. The cubic root of 205121894 is about 589.7536978247.

The spelling of 205121894 in words is "two hundred five million, one hundred twenty-one thousand, eight hundred ninety-four".