204651 has 6 divisors (see below), whose sum is σ = 295620. Its totient is φ = 136428.

The previous prime is 204641. The next prime is 204667. The reversal of 204651 is 156402.

It is a happy number.

It is not a de Polignac number, because 204651 - 2⁶ = 204587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11361 + ... + 11378.

It is an arithmetic number, because the mean of its divisors is an integer number (49270).

2²⁰⁴⁶⁵¹ is an apocalyptic number.

204651 is a deficient number, since it is larger than the sum of its proper divisors (90969).

204651 is a wasteful number, since it uses less digits than its factorization.

204651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22745 (or 22742 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 204651 is about 452.3836867085. The cubic root of 204651 is about 58.9302057004.

The spelling of 204651 in words is "two hundred four thousand, six hundred fifty-one".