516329621 has 8 divisors (see below), whose sum is σ = 521910840. Its totient is φ = 510763968.

The previous prime is 516329609. The next prime is 516329623. The reversal of 516329621 is 126923615.

It can be written as a sum of positive squares in 4 ways, for example, as 242923396 + 273406225 = 15586^2 + 16535^2 .

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 516329621 - 2²² = 512135317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516329623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70295 + ... + 77291.

It is an arithmetic number, because the mean of its divisors is an integer number (65238855).

Almost surely, 2^516329621 is an apocalyptic number.

It is an amenable number.

516329621 is a deficient number, since it is larger than the sum of its proper divisors (5581219).

516329621 is a wasteful number, since it uses less digits than its factorization.

516329621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7783.

The product of its digits is 19440, while the sum is 35.

The square root of 516329621 is about 22722.8876025914. The cubic root of 516329621 is about 802.2486842890.

The spelling of 516329621 in words is "five hundred sixteen million, three hundred twenty-nine thousand, six hundred twenty-one".