205142569 has 2 divisors, whose sum is σ = 205142570. Its totient is φ = 205142568.

The previous prime is 205142521. The next prime is 205142579. The reversal of 205142569 is 965241502.

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., 142922025 + 62220544 = 11955^2 + 7888^2 .

It is a cyclic number.

It is not a de Polignac number, because 205142569 - 2⁹ = 205142057 is a prime.

It is a super-2 number, since 2×205142569² = 84166947231839522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205142579) 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, 102571284 + 102571285.

It is an arithmetic number, because the mean of its divisors is an integer number (102571285).

Almost surely, 2^205142569 is an apocalyptic number.

It is an amenable number.

205142569 is a deficient number, since it is larger than the sum of its proper divisors (1).

205142569 is an equidigital number, since it uses as much as digits as its factorization.

205142569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 205142569 is about 14322.7989233948. The cubic root of 205142569 is about 589.7735116499.

The spelling of 205142569 in words is "two hundred five million, one hundred forty-two thousand, five hundred sixty-nine".