13519543123 has 4 divisors (see below), whose sum is σ = 13569431008. Its totient is φ = 13469655240.

The previous prime is 13519543111. The next prime is 13519543153. The reversal of 13519543123 is 32134591531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32134591531 = 7 ⋅4590655933.

It is a cyclic number.

It is not a de Polignac number, because 13519543123 - 2⁹ = 13519542611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13519543153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24943536 + ... + 24944077.

It is an arithmetic number, because the mean of its divisors is an integer number (3392357752).

Almost surely, 2^13519543123 is an apocalyptic number.

13519543123 is a deficient number, since it is larger than the sum of its proper divisors (49887885).

13519543123 is an equidigital number, since it uses as much as digits as its factorization.

13519543123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49887884.

The product of its digits is 48600, while the sum is 37.

The spelling of 13519543123 in words is "thirteen billion, five hundred nineteen million, five hundred forty-three thousand, one hundred twenty-three".