521523442087 has 2 divisors, whose sum is σ = 521523442088. Its totient is φ = 521523442086.

The previous prime is 521523442079. The next prime is 521523442151. The reversal of 521523442087 is 780244325125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521523442087 - 2³ = 521523442079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521527442087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260761721043 + 260761721044.

It is an arithmetic number, because the mean of its divisors is an integer number (260761721044).

Almost surely, 2^521523442087 is an apocalyptic number.

521523442087 is a deficient number, since it is larger than the sum of its proper divisors (1).

521523442087 is an equidigital number, since it uses as much as digits as its factorization.

521523442087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 537600, while the sum is 43.

The spelling of 521523442087 in words is "five hundred twenty-one billion, five hundred twenty-three million, four hundred forty-two thousand, eighty-seven".