13531044581 has 2 divisors, whose sum is σ = 13531044582. Its totient is φ = 13531044580.

The previous prime is 13531044521. The next prime is 13531044623. The reversal of 13531044581 is 18544013531.

It is a happy number.

13531044581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13417515556 + 113529025 = 115834^2 + 10655^2 .

It is a cyclic number.

It is not a de Polignac number, because 13531044581 - 2¹⁴ = 13531028197 is a prime.

It is a super-2 number, since 2×13531044581² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13531044521) 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 as a sum of consecutive naturals, namely, 6765522290 + 6765522291.

It is an arithmetic number, because the mean of its divisors is an integer number (6765522291).

Almost surely, 2^13531044581 is an apocalyptic number.

It is an amenable number.

13531044581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531044581 is an equidigital number, since it uses as much as digits as its factorization.

13531044581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 13531044581 in words is "thirteen billion, five hundred thirty-one million, forty-four thousand, five hundred eighty-one".