13587537581 has 2 divisors, whose sum is σ = 13587537582. Its totient is φ = 13587537580.

The previous prime is 13587537559. The next prime is 13587537617. The reversal of 13587537581 is 18573578531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13575745225 + 11792356 = 116515^2 + 3434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13587537581 is a prime.

It is a super-2 number, since 2×13587537581² (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 (13587537541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6793768790 + 6793768791.

It is an arithmetic number, because the mean of its divisors is an integer number (6793768791).

Almost surely, 2^13587537581 is an apocalyptic number.

It is an amenable number.

13587537581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13587537581 is an equidigital number, since it uses as much as digits as its factorization.

13587537581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528000, while the sum is 53.

The spelling of 13587537581 in words is "thirteen billion, five hundred eighty-seven million, five hundred thirty-seven thousand, five hundred eighty-one".