205369729 has 2 divisors, whose sum is σ = 205369730. Its totient is φ = 205369728.

The previous prime is 205369711. The next prime is 205369733. The reversal of 205369729 is 927963502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201072400 + 4297329 = 14180^2 + 2073^2 .

It is a cyclic number.

It is not a de Polignac number, because 205369729 - 2⁷ = 205369601 is a prime.

It is not a weakly prime, because it can be changed into another prime (205369709) 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, 102684864 + 102684865.

It is an arithmetic number, because the mean of its divisors is an integer number (102684865).

Almost surely, 2^205369729 is an apocalyptic number.

It is an amenable number.

205369729 is a deficient number, since it is larger than the sum of its proper divisors (1).

205369729 is an equidigital number, since it uses as much as digits as its factorization.

205369729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 205369729 is about 14330.7267436093. The cubic root of 205369729 is about 589.9911221493.

The spelling of 205369729 in words is "two hundred five million, three hundred sixty-nine thousand, seven hundred twenty-nine".