521443242301081 has 2 divisors, whose sum is σ = 521443242301082. Its totient is φ = 521443242301080.

The previous prime is 521443242301013. The next prime is 521443242301151. The reversal of 521443242301081 is 180103242344125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519154630051225 + 2288612249856 = 22784965^2 + 1512816^2 .

It is a cyclic number.

It is not a de Polignac number, because 521443242301081 - 2³³ = 521434652366489 is a prime.

It is a super-2 number, since 2×521443242301081² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521443242301781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260721621150540 + 260721621150541.

It is an arithmetic number, because the mean of its divisors is an integer number (260721621150541).

Almost surely, 2^{521443242301081} is an apocalyptic number.

It is an amenable number.

521443242301081 is a deficient number, since it is larger than the sum of its proper divisors (1).

521443242301081 is an equidigital number, since it uses as much as digits as its factorization.

521443242301081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 521443242301081 in words is "five hundred twenty-one trillion, four hundred forty-three billion, two hundred forty-two million, three hundred one thousand, eighty-one".