13134561521 has 2 divisors, whose sum is σ = 13134561522. Its totient is φ = 13134561520.

The previous prime is 13134561511. The next prime is 13134561553. The reversal of 13134561521 is 12516543131.

It is an a-pointer prime, because the next prime (13134561553) can be obtained adding 13134561521 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8829233296 + 4305328225 = 93964^2 + 65615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13134561521 is a prime.

It is not a weakly prime, because it can be changed into another prime (13134561511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6567280760 + 6567280761.

It is an arithmetic number, because the mean of its divisors is an integer number (6567280761).

Almost surely, 2^13134561521 is an apocalyptic number.

It is an amenable number.

13134561521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13134561521 is an equidigital number, since it uses as much as digits as its factorization.

13134561521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 32.

The spelling of 13134561521 in words is "thirteen billion, one hundred thirty-four million, five hundred sixty-one thousand, five hundred twenty-one".