13531044521 has 2 divisors, whose sum is σ = 13531044522. Its totient is φ = 13531044520.

The previous prime is 13531044497. The next prime is 13531044581. The reversal of 13531044521 is 12544013531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11346510400 + 2184534121 = 106520^2 + 46739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13531044521 is a prime.

It is not a weakly prime, because it can be changed into another prime (13531044581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765522260 + 6765522261.

It is an arithmetic number, because the mean of its divisors is an integer number (6765522261).

Almost surely, 2^13531044521 is an apocalyptic number.

It is an amenable number.

13531044521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531044521 is an equidigital number, since it uses as much as digits as its factorization.

13531044521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 13531044521 in words is "thirteen billion, five hundred thirty-one million, forty-four thousand, five hundred twenty-one".