205563013 has 2 divisors, whose sum is σ = 205563014. Its totient is φ = 205563012.

The previous prime is 205563011. The next prime is 205563019. The reversal of 205563013 is 310365502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194686209 + 10876804 = 13953^2 + 3298^2 .

It is a cyclic number.

It is not a de Polignac number, because 205563013 - 2¹ = 205563011 is a prime.

Together with 205563011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205563011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102781506 + 102781507.

It is an arithmetic number, because the mean of its divisors is an integer number (102781507).

Almost surely, 2^205563013 is an apocalyptic number.

It is an amenable number.

205563013 is a deficient number, since it is larger than the sum of its proper divisors (1).

205563013 is an equidigital number, since it uses as much as digits as its factorization.

205563013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 205563013 is about 14337.4688491379. The cubic root of 205563013 is about 590.1761544295.

The spelling of 205563013 in words is "two hundred five million, five hundred sixty-three thousand, thirteen".