13521547 has 4 divisors (see below), whose sum is σ = 14561680. Its totient is φ = 12481416.

The previous prime is 13521533. The next prime is 13521551. The reversal of 13521547 is 74512531.

It is a happy number.

13521547 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, and also an emirpimes, since its reverse is a distinct semiprime: 74512531 = 47 ⋅1585373.

It is a cyclic number.

It is not a de Polignac number, because 13521547 - 2⁷ = 13521419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13521517) 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, 520047 + ... + 520072.

It is an arithmetic number, because the mean of its divisors is an integer number (3640420).

Almost surely, 2^13521547 is an apocalyptic number.

13521547 is a deficient number, since it is larger than the sum of its proper divisors (1040133).

13521547 is a wasteful number, since it uses less digits than its factorization.

13521547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040132.

The product of its digits is 4200, while the sum is 28.

The square root of 13521547 is about 3677.1656204202. The cubic root of 13521547 is about 238.2367709410.

The spelling of 13521547 in words is "thirteen million, five hundred twenty-one thousand, five hundred forty-seven".