205663013 has 2 divisors, whose sum is σ = 205663014.
Its totient is φ = 205663012.
The previous prime is 205662997. The next prime is 205663019. The reversal of 205663013 is 310366502.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 191047684 + 14615329 = 13822^2 + 3823^2
It is a cyclic number.
It is not a de Polignac number, because 205663013 - 24 = 205662997 is a prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (205663019) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102831506 + 102831507.
It is an arithmetic number, because the mean of its divisors is an integer number (102831507).
Almost surely, 2205663013 is an apocalyptic number.
It is an amenable number.
205663013 is a deficient number, since it is larger than the sum of its proper divisors (1).
205663013 is an equidigital number, since it uses as much as digits as its factorization.
205663013 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 3240, while the sum is 26.
The square root of 205663013 is about 14340.9557910203.
The cubic root of 205663013 is about 590.2718396845.
The spelling of 205663013 in words is "two hundred five million, six hundred sixty-three thousand, thirteen".