521971232339 has 2 divisors, whose sum is σ = 521971232340. Its totient is φ = 521971232338.

The previous prime is 521971232309. The next prime is 521971232351. The reversal of 521971232339 is 933232179125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521971232339 - 2¹⁶ = 521971166803 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 521971232293 and 521971232302.

It is not a weakly prime, because it can be changed into another prime (521971232309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260985616169 + 260985616170.

It is an arithmetic number, because the mean of its divisors is an integer number (260985616170).

Almost surely, 2^521971232339 is an apocalyptic number.

521971232339 is a deficient number, since it is larger than the sum of its proper divisors (1).

521971232339 is an equidigital number, since it uses as much as digits as its factorization.

521971232339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 47.

The spelling of 521971232339 in words is "five hundred twenty-one billion, nine hundred seventy-one million, two hundred thirty-two thousand, three hundred thirty-nine".