521971232329 has 8 divisors (see below), whose sum is σ = 552712177800. Its totient is φ = 491234370816.

The previous prime is 521971232309. The next prime is 521971232339. The reversal of 521971232329 is 923232179125.

It can be written as a sum of positive squares in 4 ways, for example, as 122446105929 + 399525126400 = 349923^2 + 632080^2 .

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 521971232329 - 2¹¹ = 521971230281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521971232309) 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, 755874 + ... + 1270939.

It is an arithmetic number, because the mean of its divisors is an integer number (69089022225).

Almost surely, 2^521971232329 is an apocalyptic number.

It is an amenable number.

521971232329 is a deficient number, since it is larger than the sum of its proper divisors (30740945471).

521971232329 is a wasteful number, since it uses less digits than its factorization.

521971232329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041979.

The product of its digits is 408240, while the sum is 46.

The spelling of 521971232329 in words is "five hundred twenty-one billion, nine hundred seventy-one million, two hundred thirty-two thousand, three hundred twenty-nine".