521318944291 has 2 divisors, whose sum is σ = 521318944292. Its totient is φ = 521318944290.

The previous prime is 521318944283. The next prime is 521318944303. The reversal of 521318944291 is 192449813125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521318944291 - 2³ = 521318944283 is a prime.

It is a super-2 number, since 2×521318944291² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521318944271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260659472145 + 260659472146.

It is an arithmetic number, because the mean of its divisors is an integer number (260659472146).

Almost surely, 2^521318944291 is an apocalyptic number.

521318944291 is a deficient number, since it is larger than the sum of its proper divisors (1).

521318944291 is an equidigital number, since it uses as much as digits as its factorization.

521318944291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 49.

The spelling of 521318944291 in words is "five hundred twenty-one billion, three hundred eighteen million, nine hundred forty-four thousand, two hundred ninety-one".