204688069 has 2 divisors, whose sum is σ = 204688070. Its totient is φ = 204688068.

The previous prime is 204688049. The next prime is 204688073. The reversal of 204688069 is 960886402.

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., 102779044 + 101909025 = 10138^2 + 10095^2 .

It is a cyclic number.

It is not a de Polignac number, because 204688069 - 2⁷ = 204687941 is a prime.

It is a super-2 number, since 2×204688069² = 83794411181897522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204688019) 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, 102344034 + 102344035.

It is an arithmetic number, because the mean of its divisors is an integer number (102344035).

Almost surely, 2^204688069 is an apocalyptic number.

It is an amenable number.

204688069 is a deficient number, since it is larger than the sum of its proper divisors (1).

204688069 is an equidigital number, since it uses as much as digits as its factorization.

204688069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 204688069 is about 14306.9238133150. The cubic root of 204688069 is about 589.3376354920.

The spelling of 204688069 in words is "two hundred four million, six hundred eighty-eight thousand, sixty-nine".