509660563 has 4 divisors (see below), whose sum is σ = 509726800. Its totient is φ = 509594328.

The previous prime is 509660549. The next prime is 509660573. The reversal of 509660563 is 365066905.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 509660563 - 2⁵ = 509660531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509660513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19788 + ... + 37561.

It is an arithmetic number, because the mean of its divisors is an integer number (127431700).

Almost surely, 2^509660563 is an apocalyptic number.

509660563 is a deficient number, since it is larger than the sum of its proper divisors (66237).

509660563 is an equidigital number, since it uses as much as digits as its factorization.

509660563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66236.

The product of its (nonzero) digits is 145800, while the sum is 40.

The square root of 509660563 is about 22575.6630688890. The cubic root of 509660563 is about 798.7796827078.

The spelling of 509660563 in words is "five hundred nine million, six hundred sixty thousand, five hundred sixty-three".