13501305521 has 4 divisors (see below), whose sum is σ = 14728696944. Its totient is φ = 12273914100.

The previous prime is 13501305443. The next prime is 13501305523. The reversal of 13501305521 is 12550310531.

It is a happy number.

13501305521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12550310531 = 11 ⋅1140937321.

It is a cyclic number.

It is not a de Polignac number, because 13501305521 - 2²² = 13497111217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13501305523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613695695 + ... + 613695716.

It is an arithmetic number, because the mean of its divisors is an integer number (3682174236).

Almost surely, 2^13501305521 is an apocalyptic number.

13501305521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13501305521 is a deficient number, since it is larger than the sum of its proper divisors (1227391423).

13501305521 is a wasteful number, since it uses less digits than its factorization.

13501305521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227391422.

The product of its (nonzero) digits is 2250, while the sum is 26.

The spelling of 13501305521 in words is "thirteen billion, five hundred one million, three hundred five thousand, five hundred twenty-one".