13281521 has 8 divisors (see below), whose sum is σ = 14529888. Its totient is φ = 12040000.

The previous prime is 13281517. The next prime is 13281523. The reversal of 13281521 is 12518231.

It is a happy number.

13281521 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 a cyclic number.

It is not a de Polignac number, because 13281521 - 2² = 13281517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13281523) 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, 2906 + ... + 5916.

It is an arithmetic number, because the mean of its divisors is an integer number (1816236).

Almost surely, 2^13281521 is an apocalyptic number.

13281521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13281521 is a deficient number, since it is larger than the sum of its proper divisors (1248367).

13281521 is a wasteful number, since it uses less digits than its factorization.

13281521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423.

The product of its digits is 480, while the sum is 23.

The square root of 13281521 is about 3644.3821149819. The cubic root of 13281521 is about 236.8186700130.

Adding to 13281521 its reverse (12518231), we get a palindrome (25799752).

The spelling of 13281521 in words is "thirteen million, two hundred eighty-one thousand, five hundred twenty-one".