205118689 has 2 divisors, whose sum is σ = 205118690. Its totient is φ = 205118688.

The previous prime is 205118671. The next prime is 205118701. The reversal of 205118689 is 986811502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109411600 + 95707089 = 10460^2 + 9783^2 .

It is a cyclic number.

It is not a de Polignac number, because 205118689 - 2⁵ = 205118657 is a prime.

It is not a weakly prime, because it can be changed into another prime (205118609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102559344 + 102559345.

It is an arithmetic number, because the mean of its divisors is an integer number (102559345).

Almost surely, 2^205118689 is an apocalyptic number.

It is an amenable number.

205118689 is a deficient number, since it is larger than the sum of its proper divisors (1).

205118689 is an equidigital number, since it uses as much as digits as its factorization.

205118689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 205118689 is about 14321.9652631893. The cubic root of 205118689 is about 589.7506262032.

The spelling of 205118689 in words is "two hundred five million, one hundred eighteen thousand, six hundred eighty-nine".