205600061 has 2 divisors, whose sum is σ = 205600062. Its totient is φ = 205600060.

The previous prime is 205600033. The next prime is 205600079. The reversal of 205600061 is 160006502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120868036 + 84732025 = 10994^2 + 9205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205600061 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205600001) 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, 102800030 + 102800031.

It is an arithmetic number, because the mean of its divisors is an integer number (102800031).

Almost surely, 2^205600061 is an apocalyptic number.

It is an amenable number.

205600061 is a deficient number, since it is larger than the sum of its proper divisors (1).

205600061 is an equidigital number, since it uses as much as digits as its factorization.

205600061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 205600061 is about 14338.7607902496. The cubic root of 205600061 is about 590.2116075208.

Adding to 205600061 its reverse (160006502), we get a palindrome (365606563).

The spelling of 205600061 in words is "two hundred five million, six hundred thousand, sixty-one".