13521317 has 4 divisors (see below), whose sum is σ = 13886796. Its totient is φ = 13155840.

The previous prime is 13521283. The next prime is 13521323. The reversal of 13521317 is 71312531.

13521317 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.

It can be written as a sum of positive squares in 2 ways, for example, as 12952801 + 568516 = 3599^2 + 754^2 .

It is a cyclic number.

It is not a de Polignac number, because 13521317 - 2⁶ = 13521253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13521292 and 13521301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521367) 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, 182684 + ... + 182757.

It is an arithmetic number, because the mean of its divisors is an integer number (3471699).

Almost surely, 2^13521317 is an apocalyptic number.

It is an amenable number.

13521317 is a deficient number, since it is larger than the sum of its proper divisors (365479).

13521317 is an equidigital number, since it uses as much as digits as its factorization.

13521317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365478.

The product of its digits is 630, while the sum is 23.

The square root of 13521317 is about 3677.1343461995. The cubic root of 13521317 is about 238.2354201397.

Adding to 13521317 its reverse (71312531), we get a palindrome (84833848).

The spelling of 13521317 in words is "thirteen million, five hundred twenty-one thousand, three hundred seventeen".