204321569 has 2 divisors, whose sum is σ = 204321570. Its totient is φ = 204321568.

The previous prime is 204321541. The next prime is 204321577. The reversal of 204321569 is 965123402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197767969 + 6553600 = 14063^2 + 2560^2 .

It is a cyclic number.

It is not a de Polignac number, because 204321569 - 2¹⁶ = 204256033 is a prime.

It is a super-2 number, since 2×204321569² = 83494607117243522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204321539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102160784 + 102160785.

It is an arithmetic number, because the mean of its divisors is an integer number (102160785).

Almost surely, 2^204321569 is an apocalyptic number.

It is an amenable number.

204321569 is a deficient number, since it is larger than the sum of its proper divisors (1).

204321569 is an equidigital number, since it uses as much as digits as its factorization.

204321569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 204321569 is about 14294.1095910169. The cubic root of 204321569 is about 588.9856832322.

The spelling of 204321569 in words is "two hundred four million, three hundred twenty-one thousand, five hundred sixty-nine".