205880189 has 2 divisors, whose sum is σ = 205880190. Its totient is φ = 205880188.

The previous prime is 205880177. The next prime is 205880203. The reversal of 205880189 is 981088502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188156089 + 17724100 = 13717^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 205880189 - 2¹² = 205876093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205880119) 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, 102940094 + 102940095.

It is an arithmetic number, because the mean of its divisors is an integer number (102940095).

Almost surely, 2^205880189 is an apocalyptic number.

It is an amenable number.

205880189 is a deficient number, since it is larger than the sum of its proper divisors (1).

205880189 is an equidigital number, since it uses as much as digits as its factorization.

205880189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 205880189 is about 14348.5256733924. The cubic root of 205880189 is about 590.4795383183.

The spelling of 205880189 in words is "two hundred five million, eight hundred eighty thousand, one hundred eighty-nine".