205218189 has 24 divisors (see below), whose sum is σ = 326413152. Its totient is φ = 123205920.

The previous prime is 205218151. The next prime is 205218193. The reversal of 205218189 is 981812502.

205218189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205218189 - 2¹³ = 205209997 is a prime.

It is a super-2 number, since 2×205218189² = 84229010192879442, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205218149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 907 + ... + 20279.

It is an arithmetic number, because the mean of its divisors is an integer number (13600548).

Almost surely, 2^205218189 is an apocalyptic number.

It is an amenable number.

205218189 is a deficient number, since it is larger than the sum of its proper divisors (121194963).

205218189 is a wasteful number, since it uses less digits than its factorization.

205218189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19497 (or 19494 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 205218189 is about 14325.4385273192. The cubic root of 205218189 is about 589.8459705164.

The spelling of 205218189 in words is "two hundred five million, two hundred eighteen thousand, one hundred eighty-nine".