13261531521349 has 4 divisors (see below), whose sum is σ = 13265285142636. Its totient is φ = 13257777900064.

The previous prime is 13261531521311. The next prime is 13261531521367. The reversal of 13261531521349 is 94312513516231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12356525584225 + 905005937124 = 3515185^2 + 951318^2 .

It is a cyclic number.

It is not a de Polignac number, because 13261531521349 - 2⁷ = 13261531521221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13261531521299 and 13261531521308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13261531524349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1876805344 + ... + 1876812409.

It is an arithmetic number, because the mean of its divisors is an integer number (3316321285659).

Almost surely, 2^{13261531521349} is an apocalyptic number.

It is an amenable number.

13261531521349 is a deficient number, since it is larger than the sum of its proper divisors (3753621287).

13261531521349 is an equidigital number, since it uses as much as digits as its factorization.

13261531521349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753621286.

The product of its digits is 583200, while the sum is 46.

The spelling of 13261531521349 in words is "thirteen trillion, two hundred sixty-one billion, five hundred thirty-one million, five hundred twenty-one thousand, three hundred forty-nine".