521327493391 has 2 divisors, whose sum is σ = 521327493392. Its totient is φ = 521327493390.

The previous prime is 521327493343. The next prime is 521327493419. The reversal of 521327493391 is 193394723125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521327493391 - 2²¹ = 521325396239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521327493311) 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 as a sum of consecutive naturals, namely, 260663746695 + 260663746696.

It is an arithmetic number, because the mean of its divisors is an integer number (260663746696).

Almost surely, 2^521327493391 is an apocalyptic number.

521327493391 is a deficient number, since it is larger than the sum of its proper divisors (1).

521327493391 is an equidigital number, since it uses as much as digits as its factorization.

521327493391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The spelling of 521327493391 in words is "five hundred twenty-one billion, three hundred twenty-seven million, four hundred ninety-three thousand, three hundred ninety-one".