520522521989 has 2 divisors, whose sum is σ = 520522521990. Its totient is φ = 520522521988.

The previous prime is 520522521941. The next prime is 520522522031. The reversal of 520522521989 is 989125225025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 263767497889 + 256755024100 = 513583^2 + 506710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520522521989 is a prime.

It is a super-2 number, since 2×520522521989² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520522521889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260261260994 + 260261260995.

It is an arithmetic number, because the mean of its divisors is an integer number (260261260995).

Almost surely, 2^520522521989 is an apocalyptic number.

It is an amenable number.

520522521989 is a deficient number, since it is larger than the sum of its proper divisors (1).

520522521989 is an equidigital number, since it uses as much as digits as its factorization.

520522521989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296000, while the sum is 50.

The spelling of 520522521989 in words is "five hundred twenty billion, five hundred twenty-two million, five hundred twenty-one thousand, nine hundred eighty-nine".