13511221543 has 2 divisors, whose sum is σ = 13511221544. Its totient is φ = 13511221542.

The previous prime is 13511221531. The next prime is 13511221547. The reversal of 13511221543 is 34512211531.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13511221543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13511221547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6755610771 + 6755610772.

It is an arithmetic number, because the mean of its divisors is an integer number (6755610772).

Almost surely, 2^13511221543 is an apocalyptic number.

13511221543 is a deficient number, since it is larger than the sum of its proper divisors (1).

13511221543 is an equidigital number, since it uses as much as digits as its factorization.

13511221543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 28.

The spelling of 13511221543 in words is "thirteen billion, five hundred eleven million, two hundred twenty-one thousand, five hundred forty-three".