520829621 has 8 divisors (see below), whose sum is σ = 561629880. Its totient is φ = 480134592.

The previous prime is 520829609. The next prime is 520829623. The reversal of 520829621 is 126928025.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12327121 + 508502500 = 3511^2 + 22550^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 520829621 - 2¹⁰ = 520828597 is a prime.

It is a super-2 number, since 2×520829621² = 542526988222007282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520829623) 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 7 ways as a sum of consecutive naturals, for example, 15866 + ... + 35963.

It is an arithmetic number, because the mean of its divisors is an integer number (70203735).

Almost surely, 2^520829621 is an apocalyptic number.

It is an amenable number.

520829621 is a deficient number, since it is larger than the sum of its proper divisors (40800259).

520829621 is a wasteful number, since it uses less digits than its factorization.

520829621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52615.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 520829621 is about 22821.6918960887. The cubic root of 520829621 is about 804.5725755837.

The spelling of 520829621 in words is "five hundred twenty million, eight hundred twenty-nine thousand, six hundred twenty-one".