521240251521013 has 2 divisors, whose sum is σ = 521240251521014. Its totient is φ = 521240251521012.

The previous prime is 521240251521007. The next prime is 521240251521029. The reversal of 521240251521013 is 310125152042125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389930699635569 + 131309551885444 = 19746663^2 + 11459038^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521240251521013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521240251521013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521240251527013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260620125760506 + 260620125760507.

It is an arithmetic number, because the mean of its divisors is an integer number (260620125760507).

Almost surely, 2^{521240251521013} is an apocalyptic number.

It is an amenable number.

521240251521013 is a deficient number, since it is larger than the sum of its proper divisors (1).

521240251521013 is an equidigital number, since it uses as much as digits as its factorization.

521240251521013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 34.

The spelling of 521240251521013 in words is "five hundred twenty-one trillion, two hundred forty billion, two hundred fifty-one million, five hundred twenty-one thousand, thirteen".