13521518 has 12 divisors (see below), whose sum is σ = 20981472. Its totient is φ = 6528660.

The previous prime is 13521517. The next prime is 13521523. The reversal of 13521518 is 81512531.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521517) 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 5 ways as a sum of consecutive naturals, for example, 28721 + ... + 29187.

It is an arithmetic number, because the mean of its divisors is an integer number (1748456).

Almost surely, 2^13521518 is an apocalyptic number.

13521518 is a deficient number, since it is larger than the sum of its proper divisors (7459954).

13521518 is an frugal number, since it uses more digits than its factorization.

13521518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967 (or 500 counting only the distinct ones).

The product of its digits is 1200, while the sum is 26.

The square root of 13521518 is about 3677.1616771635. The cubic root of 13521518 is about 238.2366006234.

The spelling of 13521518 in words is "thirteen million, five hundred twenty-one thousand, five hundred eighteen".