205043513 has 2 divisors, whose sum is σ = 205043514. Its totient is φ = 205043512.

The previous prime is 205043507. The next prime is 205043557. The reversal of 205043513 is 315340502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105103504 + 99940009 = 10252^2 + 9997^2 .

It is a cyclic number.

It is not a de Polignac number, because 205043513 - 2¹⁰ = 205042489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205043593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102521756 + 102521757.

It is an arithmetic number, because the mean of its divisors is an integer number (102521757).

Almost surely, 2^205043513 is an apocalyptic number.

It is an amenable number.

205043513 is a deficient number, since it is larger than the sum of its proper divisors (1).

205043513 is an equidigital number, since it uses as much as digits as its factorization.

205043513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 205043513 is about 14319.3405225241. The cubic root of 205043513 is about 589.6785695309.

The spelling of 205043513 in words is "two hundred five million, forty-three thousand, five hundred thirteen".