13505104523 has 4 divisors (see below), whose sum is σ = 13940753088. Its totient is φ = 13069455960.

The previous prime is 13505104519. The next prime is 13505104537. The reversal of 13505104523 is 32540150531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32540150531 = 7 ⋅4648592933.

It is a cyclic number.

It is not a de Polignac number, because 13505104523 - 2² = 13505104519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13505104573) 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, 217824236 + ... + 217824297.

It is an arithmetic number, because the mean of its divisors is an integer number (3485188272).

Almost surely, 2^13505104523 is an apocalyptic number.

13505104523 is a deficient number, since it is larger than the sum of its proper divisors (435648565).

13505104523 is an equidigital number, since it uses as much as digits as its factorization.

13505104523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435648564.

The product of its (nonzero) digits is 9000, while the sum is 29.

The spelling of 13505104523 in words is "thirteen billion, five hundred five million, one hundred four thousand, five hundred twenty-three".