205682189 has 2 divisors, whose sum is σ = 205682190. Its totient is φ = 205682188.

The previous prime is 205682177. The next prime is 205682207. The reversal of 205682189 is 981286502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110775625 + 94906564 = 10525^2 + 9742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205682189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205682129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102841094 + 102841095.

It is an arithmetic number, because the mean of its divisors is an integer number (102841095).

Almost surely, 2^205682189 is an apocalyptic number.

It is an amenable number.

205682189 is a deficient number, since it is larger than the sum of its proper divisors (1).

205682189 is an equidigital number, since it uses as much as digits as its factorization.

205682189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 205682189 is about 14341.6243501216. The cubic root of 205682189 is about 590.2901847447.

The spelling of 205682189 in words is "two hundred five million, six hundred eighty-two thousand, one hundred eighty-nine".