204205999 has 2 divisors, whose sum is σ = 204206000. Its totient is φ = 204205998.

The previous prime is 204205993. The next prime is 204206003. The reversal of 204205999 is 999502402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204205999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204205993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102102999 + 102103000.

It is an arithmetic number, because the mean of its divisors is an integer number (102103000).

Almost surely, 2^204205999 is an apocalyptic number.

204205999 is a deficient number, since it is larger than the sum of its proper divisors (1).

204205999 is an equidigital number, since it uses as much as digits as its factorization.

204205999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 204205999 is about 14290.0664449120. The cubic root of 204205999 is about 588.8746133573.

The spelling of 204205999 in words is "two hundred four million, two hundred five thousand, nine hundred ninety-nine".