517421809 has 8 divisors (see below), whose sum is σ = 548069760. Its totient is φ = 486797376.

The previous prime is 517421789. The next prime is 517421831. The reversal of 517421809 is 908124715.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-517421809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (517421309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61732 + ... + 69610.

It is an arithmetic number, because the mean of its divisors is an integer number (68508720).

Almost surely, 2^517421809 is an apocalyptic number.

It is an amenable number.

517421809 is a deficient number, since it is larger than the sum of its proper divisors (30647951).

517421809 is a wasteful number, since it uses less digits than its factorization.

517421809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11759.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 517421809 is about 22746.9076799463. The cubic root of 517421809 is about 802.8139493603.

The spelling of 517421809 in words is "five hundred seventeen million, four hundred twenty-one thousand, eight hundred nine".