13521005 has 8 divisors (see below), whose sum is σ = 16335000. Its totient is φ = 10743616.

The previous prime is 13520999. The next prime is 13521023. The reversal of 13521005 is 50012531.

13521005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 676 + 13520329 = 26^2 + 3677^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13521005 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8330 + ... + 9819.

It is an arithmetic number, because the mean of its divisors is an integer number (2041875).

Almost surely, 2^13521005 is an apocalyptic number.

It is an amenable number.

13521005 is a deficient number, since it is larger than the sum of its proper divisors (2813995).

13521005 is a wasteful number, since it uses less digits than its factorization.

13521005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18303.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 13521005 is about 3677.0919216141. The cubic root of 13521005 is about 238.2335877240.

Adding to 13521005 its reverse (50012531), we get a palindrome (63533536).

The spelling of 13521005 in words is "thirteen million, five hundred twenty-one thousand, five".