521513323109489 has 2 divisors, whose sum is σ = 521513323109490. Its totient is φ = 521513323109488.

The previous prime is 521513323109459. The next prime is 521513323109491. The reversal of 521513323109489 is 984901323315125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400306258599025 + 121207064510464 = 20007655^2 + 11009408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521513323109489 is a prime.

It is a super-2 number, since 2×521513323109489² (a number of 30 digits) contains 22 as substring.

Together with 521513323109491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (521513323109459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260756661554744 + 260756661554745.

It is an arithmetic number, because the mean of its divisors is an integer number (260756661554745).

Almost surely, 2^{521513323109489} is an apocalyptic number.

It is an amenable number.

521513323109489 is a deficient number, since it is larger than the sum of its proper divisors (1).

521513323109489 is an equidigital number, since it uses as much as digits as its factorization.

521513323109489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 521513323109489 in words is "five hundred twenty-one trillion, five hundred thirteen billion, three hundred twenty-three million, one hundred nine thousand, four hundred eighty-nine".