205510189 has 2 divisors, whose sum is σ = 205510190. Its totient is φ = 205510188.

The previous prime is 205510183. The next prime is 205510219. The reversal of 205510189 is 981015502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115734564 + 89775625 = 10758^2 + 9475^2 .

It is a cyclic number.

It is not a de Polignac number, because 205510189 - 2³ = 205510181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205510189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205510181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102755094 + 102755095.

It is an arithmetic number, because the mean of its divisors is an integer number (102755095).

Almost surely, 2^205510189 is an apocalyptic number.

It is an amenable number.

205510189 is a deficient number, since it is larger than the sum of its proper divisors (1).

205510189 is an equidigital number, since it uses as much as digits as its factorization.

205510189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 205510189 is about 14335.6265646117. The cubic root of 205510189 is about 590.1255971243.

The spelling of 205510189 in words is "two hundred five million, five hundred ten thousand, one hundred eighty-nine".