205012289 has 2 divisors, whose sum is σ = 205012290. Its totient is φ = 205012288.

The previous prime is 205012253. The next prime is 205012307. The reversal of 205012289 is 982210502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156250000 + 48762289 = 12500^2 + 6983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205012289 is a prime.

It is not a weakly prime, because it can be changed into another prime (205014289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102506144 + 102506145.

It is an arithmetic number, because the mean of its divisors is an integer number (102506145).

Almost surely, 2^205012289 is an apocalyptic number.

It is an amenable number.

205012289 is a deficient number, since it is larger than the sum of its proper divisors (1).

205012289 is an equidigital number, since it uses as much as digits as its factorization.

205012289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 205012289 is about 14318.2502073403. The cubic root of 205012289 is about 589.6486359523.

The spelling of 205012289 in words is "two hundred five million, twelve thousand, two hundred eighty-nine".