205934861 has 12 divisors (see below), whose sum is σ = 229555872. Its totient is φ = 184569000.

The previous prime is 205934851. The next prime is 205934867. The reversal of 205934861 is 168439502.

It is a happy number.

It is not a de Polignac number, because 205934861 - 2¹⁸ = 205672717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205934867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3395 + ... + 20576.

It is an arithmetic number, because the mean of its divisors is an integer number (19129656).

Almost surely, 2^205934861 is an apocalyptic number.

It is an amenable number.

205934861 is a deficient number, since it is larger than the sum of its proper divisors (23621011).

205934861 is a wasteful number, since it uses less digits than its factorization.

205934861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24064 (or 24053 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 205934861 is about 14350.4306904009. The cubic root of 205934861 is about 590.5318014660.

The spelling of 205934861 in words is "two hundred five million, nine hundred thirty-four thousand, eight hundred sixty-one".