516821330 has 24 divisors (see below), whose sum is σ = 936084492. Its totient is φ = 205446176.

The previous prime is 516821287. The next prime is 516821351. The reversal of 516821330 is 33128615.

It can be written as a sum of positive squares in 2 ways, for example, as 516789289 + 32041 = 22733^2 + 179^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 516821293 and 516821302.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319604 + ... + 321216.

Almost surely, 2^516821330 is an apocalyptic number.

516821330 is a deficient number, since it is larger than the sum of its proper divisors (419263162).

516821330 is a wasteful number, since it uses less digits than its factorization.

516821330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 516821330 is about 22733.7047134865. The cubic root of 516821330 is about 802.5032682650.

Adding to 516821330 its reverse (33128615), we get a palindrome (549949945).

The spelling of 516821330 in words is "five hundred sixteen million, eight hundred twenty-one thousand, three hundred thirty".