205081913 has 2 divisors, whose sum is σ = 205081914. Its totient is φ = 205081912.

The previous prime is 205081909. The next prime is 205081937. The reversal of 205081913 is 319180502.

205081913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199713424 + 5368489 = 14132^2 + 2317^2 .

It is a cyclic number.

It is not a de Polignac number, because 205081913 - 2² = 205081909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (205081313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102540956 + 102540957.

It is an arithmetic number, because the mean of its divisors is an integer number (102540957).

Almost surely, 2^205081913 is an apocalyptic number.

It is an amenable number.

205081913 is a deficient number, since it is larger than the sum of its proper divisors (1).

205081913 is an equidigital number, since it uses as much as digits as its factorization.

205081913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 205081913 is about 14320.6813036252. The cubic root of 205081913 is about 589.7153783743.

The spelling of 205081913 in words is "two hundred five million, eighty-one thousand, nine hundred thirteen".