512642813 has 4 divisors (see below), whose sum is σ = 512692860. Its totient is φ = 512592768.

The previous prime is 512642797. The next prime is 512642821. The reversal of 512642813 is 318246215.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 334633849 + 178008964 = 18293^2 + 13342^2 .

It is a cyclic number.

It is not a de Polignac number, because 512642813 - 2⁴ = 512642797 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 512642813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512642833) 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 3 ways as a sum of consecutive naturals, for example, 3470 + ... + 32207.

It is an arithmetic number, because the mean of its divisors is an integer number (128173215).

Almost surely, 2^512642813 is an apocalyptic number.

It is an amenable number.

512642813 is a deficient number, since it is larger than the sum of its proper divisors (50047).

512642813 is a wasteful number, since it uses less digits than its factorization.

512642813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50046.

The product of its digits is 11520, while the sum is 32.

The square root of 512642813 is about 22641.6168371431. The cubic root of 512642813 is about 800.3346584227.

The spelling of 512642813 in words is "five hundred twelve million, six hundred forty-two thousand, eight hundred thirteen".