13521231 has 12 divisors (see below), whose sum is σ = 19562608. Its totient is φ = 8999424.

The previous prime is 13521197. The next prime is 13521253. The reversal of 13521231 is 13212531.

It is not a de Polignac number, because 13521231 - 2⁹ = 13520719 is a prime.

It is a super-2 number, since 2×13521231² = 365647375510722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9726 + ... + 11028.

Almost surely, 2^13521231 is an apocalyptic number.

13521231 is a deficient number, since it is larger than the sum of its proper divisors (6041377).

13521231 is a wasteful number, since it uses less digits than its factorization.

13521231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462 (or 2459 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 13521231 is about 3677.1226522921. The cubic root of 13521231 is about 238.2349150536.

Adding to 13521231 its reverse (13212531), we get a palindrome (26733762).

The spelling of 13521231 in words is "thirteen million, five hundred twenty-one thousand, two hundred thirty-one".