13507521 has 8 divisors (see below), whose sum is σ = 18046560. Its totient is φ = 8986752.

The previous prime is 13507517. The next prime is 13507531. The reversal of 13507521 is 12570531.

13507521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13507521 - 2² = 13507517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13507491 and 13507500.

It is not an unprimeable number, because it can be changed into a prime (13507511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2736 + ... + 5873.

It is an arithmetic number, because the mean of its divisors is an integer number (2255820).

Almost surely, 2^13507521 is an apocalyptic number.

It is an amenable number.

13507521 is a deficient number, since it is larger than the sum of its proper divisors (4539039).

13507521 is an equidigital number, since it uses as much as digits as its factorization.

13507521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9135.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 13507521 is about 3675.2579501308. The cubic root of 13507521 is about 238.1543675245.

It can be divided in two parts, 13507 and 521, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 13507521 in words is "thirteen million, five hundred seven thousand, five hundred twenty-one".