13715521 has 8 divisors (see below), whose sum is σ = 14806080. Its totient is φ = 12666192.

The previous prime is 13715491. The next prime is 13715531. The reversal of 13715521 is 12551731.

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

It is a de Polignac number, because none of the positive numbers 2^k-13715521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13715531) 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, 9615 + ... + 10948.

It is an arithmetic number, because the mean of its divisors is an integer number (1850760).

Almost surely, 2^13715521 is an apocalyptic number.

It is an amenable number.

13715521 is a deficient number, since it is larger than the sum of its proper divisors (1090559).

13715521 is a wasteful number, since it uses less digits than its factorization.

13715521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20615.

The product of its digits is 1050, while the sum is 25.

The square root of 13715521 is about 3703.4471779681. The cubic root of 13715521 is about 239.3705787393.

The spelling of 13715521 in words is "thirteen million, seven hundred fifteen thousand, five hundred twenty-one".