205885081 has 2 divisors, whose sum is σ = 205885082. Its totient is φ = 205885080.

The previous prime is 205885073. The next prime is 205885087. The reversal of 205885081 is 180588502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168870025 + 37015056 = 12995^2 + 6084^2 .

It is a cyclic number.

It is not a de Polignac number, because 205885081 - 2³ = 205885073 is a prime.

It is a super-2 number, since 2×205885081² = 84777333156753122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205885081.

It is not a weakly prime, because it can be changed into another prime (205885087) 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, 102942540 + 102942541.

It is an arithmetic number, because the mean of its divisors is an integer number (102942541).

Almost surely, 2^205885081 is an apocalyptic number.

It is an amenable number.

205885081 is a deficient number, since it is larger than the sum of its proper divisors (1).

205885081 is an equidigital number, since it uses as much as digits as its factorization.

205885081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25600, while the sum is 37.

The square root of 205885081 is about 14348.6961428556. The cubic root of 205885081 is about 590.4842151533.

The spelling of 205885081 in words is "two hundred five million, eight hundred eighty-five thousand, eighty-one".