513641455235621 has 2 divisors, whose sum is σ = 513641455235622. Its totient is φ = 513641455235620.

The previous prime is 513641455235599. The next prime is 513641455235683. The reversal of 513641455235621 is 126532554146315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 447765279016225 + 65876176219396 = 21160465^2 + 8116414^2 .

It is a cyclic number.

It is not a de Polignac number, because 513641455235621 - 2¹⁰ = 513641455234597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513641455225621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256820727617810 + 256820727617811.

It is an arithmetic number, because the mean of its divisors is an integer number (256820727617811).

Almost surely, 2^{513641455235621} is an apocalyptic number.

It is an amenable number.

513641455235621 is a deficient number, since it is larger than the sum of its proper divisors (1).

513641455235621 is an equidigital number, since it uses as much as digits as its factorization.

513641455235621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960000, while the sum is 53.

The spelling of 513641455235621 in words is "five hundred thirteen trillion, six hundred forty-one billion, four hundred fifty-five million, two hundred thirty-five thousand, six hundred twenty-one".