513806506 has 8 divisors (see below), whose sum is σ = 789507684. Its totient is φ = 250637280.

The previous prime is 513806443. The next prime is 513806519. The reversal of 513806506 is 605608315.

It can be written as a sum of positive squares in 2 ways, for example, as 510534025 + 3272481 = 22595^2 + 1809^2 .

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

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 3132885 + ... + 3133048.

Almost surely, 2^513806506 is an apocalyptic number.

513806506 is a deficient number, since it is larger than the sum of its proper divisors (275701178).

513806506 is a wasteful number, since it uses less digits than its factorization.

513806506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6265976.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 513806506 is about 22667.3003685926. The cubic root of 513806506 is about 800.9397841166.

The spelling of 513806506 in words is "five hundred thirteen million, eight hundred six thousand, five hundred six".