205042069 has 2 divisors, whose sum is σ = 205042070. Its totient is φ = 205042068.

The previous prime is 205042039. The next prime is 205042073. The reversal of 205042069 is 960240502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186868900 + 18173169 = 13670^2 + 4263^2 .

It is a cyclic number.

It is not a de Polignac number, because 205042069 - 2¹⁷ = 204910997 is a prime.

It is a super-2 number, since 2×205042069² = 84084500119601522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205042039) 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, 102521034 + 102521035.

It is an arithmetic number, because the mean of its divisors is an integer number (102521035).

Almost surely, 2^205042069 is an apocalyptic number.

It is an amenable number.

205042069 is a deficient number, since it is larger than the sum of its proper divisors (1).

205042069 is an equidigital number, since it uses as much as digits as its factorization.

205042069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 205042069 is about 14319.2901011188. The cubic root of 205042069 is about 589.6771852754.

The spelling of 205042069 in words is "two hundred five million, forty-two thousand, sixty-nine".