521252462891 has 2 divisors, whose sum is σ = 521252462892. Its totient is φ = 521252462890.

The previous prime is 521252462879. The next prime is 521252462917. The reversal of 521252462891 is 198264252125.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521252462891 is a prime.

It is not a weakly prime, because it can be changed into another prime (521252462821) 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, 260626231445 + 260626231446.

It is an arithmetic number, because the mean of its divisors is an integer number (260626231446).

Almost surely, 2^521252462891 is an apocalyptic number.

521252462891 is a deficient number, since it is larger than the sum of its proper divisors (1).

521252462891 is an equidigital number, since it uses as much as digits as its factorization.

521252462891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 47.

The spelling of 521252462891 in words is "five hundred twenty-one billion, two hundred fifty-two million, four hundred sixty-two thousand, eight hundred ninety-one".