205084643 has 4 divisors (see below), whose sum is σ = 206461200. Its totient is φ = 203708088.

The previous prime is 205084637. The next prime is 205084657. The reversal of 205084643 is 346480502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205084643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205084343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688055 + ... + 688352.

It is an arithmetic number, because the mean of its divisors is an integer number (51615300).

Almost surely, 2^205084643 is an apocalyptic number.

205084643 is a deficient number, since it is larger than the sum of its proper divisors (1376557).

205084643 is a wasteful number, since it uses less digits than its factorization.

205084643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376556.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 205084643 is about 14320.7766200021. The cubic root of 205084643 is about 589.7179950781.

The spelling of 205084643 in words is "two hundred five million, eighty-four thousand, six hundred forty-three".