13531643539 has 2 divisors, whose sum is σ = 13531643540. Its totient is φ = 13531643538.

The previous prime is 13531643509. The next prime is 13531643557. The reversal of 13531643539 is 93534613531.

It is a strong prime.

It is an emirp because it is prime and its reverse (93534613531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13531643539 - 2⁵ = 13531643507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13531643495 and 13531643504.

It is not a weakly prime, because it can be changed into another prime (13531643509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765821769 + 6765821770.

It is an arithmetic number, because the mean of its divisors is an integer number (6765821770).

Almost surely, 2^13531643539 is an apocalyptic number.

13531643539 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531643539 is an equidigital number, since it uses as much as digits as its factorization.

13531643539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 437400, while the sum is 43.

The spelling of 13531643539 in words is "thirteen billion, five hundred thirty-one million, six hundred forty-three thousand, five hundred thirty-nine".