204917 has 2 divisors, whose sum is σ = 204918. Its totient is φ = 204916.

The previous prime is 204913. The next prime is 204923. The reversal of 204917 is 719402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167281 + 37636 = 409^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 204917 - 2² = 204913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204892 and 204901.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 204917.

It is not a weakly prime, because it can be changed into another prime (204913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102458 + 102459.

It is an arithmetic number, because the mean of its divisors is an integer number (102459).

2²⁰⁴⁹¹⁷ is an apocalyptic number.

It is an amenable number.

204917 is a deficient number, since it is larger than the sum of its proper divisors (1).

204917 is an equidigital number, since it uses as much as digits as its factorization.

204917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 204917 is about 452.6775894608. The cubic root of 204917 is about 58.9557266249.

The spelling of 204917 in words is "two hundred four thousand, nine hundred seventeen".