13521381 has 8 divisors (see below), whose sum is σ = 18079104. Its totient is φ = 8988960.

The previous prime is 13521373. The next prime is 13521397. The reversal of 13521381 is 18312531.

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

It is not a de Polignac number, because 13521381 - 2³ = 13521373 is a prime.

It is a super-2 number, since 2×13521381² = 365655488294322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521581) 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 7 ways as a sum of consecutive naturals, for example, 5040 + ... + 7241.

It is an arithmetic number, because the mean of its divisors is an integer number (2259888).

Almost surely, 2^13521381 is an apocalyptic number.

It is an amenable number.

13521381 is a deficient number, since it is larger than the sum of its proper divisors (4557723).

13521381 is a wasteful number, since it uses less digits than its factorization.

13521381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12651.

The product of its digits is 720, while the sum is 24.

The square root of 13521381 is about 3677.1430486180. The cubic root of 13521381 is about 238.2357960164.

The spelling of 13521381 in words is "thirteen million, five hundred twenty-one thousand, three hundred eighty-one".