204891 has 8 divisors (see below), whose sum is σ = 275520. Its totient is φ = 135432.

The previous prime is 204887. The next prime is 204913. The reversal of 204891 is 198402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204891 - 2² = 204887 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204821) 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, 280 + ... + 698.

It is an arithmetic number, because the mean of its divisors is an integer number (34440).

2²⁰⁴⁸⁹¹ is an apocalyptic number.

204891 is a deficient number, since it is larger than the sum of its proper divisors (70629).

204891 is a wasteful number, since it uses less digits than its factorization.

204891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 204891 is about 452.6488705387. The cubic root of 204891 is about 58.9532330726.

The spelling of 204891 in words is "two hundred four thousand, eight hundred ninety-one".