205655161 has 2 divisors, whose sum is σ = 205655162. Its totient is φ = 205655160.

The previous prime is 205655123. The next prime is 205655173. The reversal of 205655161 is 161556502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125014761 + 80640400 = 11181^2 + 8980^2 .

It is a cyclic number.

It is not a de Polignac number, because 205655161 - 2¹⁹ = 205130873 is a prime.

It is equal to p_11374636 and since 205655161 and 11374636 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (205655101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102827580 + 102827581.

It is an arithmetic number, because the mean of its divisors is an integer number (102827581).

Almost surely, 2^205655161 is an apocalyptic number.

It is an amenable number.

205655161 is a deficient number, since it is larger than the sum of its proper divisors (1).

205655161 is an equidigital number, since it uses as much as digits as its factorization.

205655161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 205655161 is about 14340.6820270167. The cubic root of 205655161 is about 590.2643276006.

The spelling of 205655161 in words is "two hundred five million, six hundred fifty-five thousand, one hundred sixty-one".