509366879 has 4 divisors (see below), whose sum is σ = 582133584. Its totient is φ = 436600176.

The previous prime is 509366861. The next prime is 509366881. The reversal of 509366879 is 978663905.

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 509366879 - 2²⁰ = 508318303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 509366879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509366279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36383342 + ... + 36383355.

It is an arithmetic number, because the mean of its divisors is an integer number (145533396).

Almost surely, 2^509366879 is an apocalyptic number.

509366879 is a deficient number, since it is larger than the sum of its proper divisors (72766705).

509366879 is an equidigital number, since it uses as much as digits as its factorization.

509366879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72766704.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The square root of 509366879 is about 22569.1576936314. The cubic root of 509366879 is about 798.6262250910.

The spelling of 509366879 in words is "five hundred nine million, three hundred sixty-six thousand, eight hundred seventy-nine".