509863 has 2 divisors, whose sum is σ = 509864. Its totient is φ = 509862.

The previous prime is 509843. The next prime is 509867. The reversal of 509863 is 368905.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254931 + 254932.

It is an arithmetic number, because the mean of its divisors is an integer number (254932).

2⁵⁰⁹⁸⁶³ is an apocalyptic number.

509863 is a deficient number, since it is larger than the sum of its proper divisors (1).

509863 is an equidigital number, since it uses as much as digits as its factorization.

509863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 509863 is about 714.0469172260. The cubic root of 509863 is about 79.8885427047. Note that the first 3 decimals are identical.

The spelling of 509863 in words is "five hundred nine thousand, eight hundred sixty-three".