13712521 has 4 divisors (see below), whose sum is σ = 13742352. Its totient is φ = 13682692.

The previous prime is 13712483. The next prime is 13712551. The reversal of 13712521 is 12521731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13712521 - 2⁹ = 13712009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13712492 and 13712501.

It is not an unprimeable number, because it can be changed into a prime (13712551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14215 + ... + 15148.

It is an arithmetic number, because the mean of its divisors is an integer number (3435588).

Almost surely, 2^13712521 is an apocalyptic number.

It is an amenable number.

13712521 is a deficient number, since it is larger than the sum of its proper divisors (29831).

13712521 is an equidigital number, since it uses as much as digits as its factorization.

13712521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29830.

The product of its digits is 420, while the sum is 22.

The square root of 13712521 is about 3703.0421277647. The cubic root of 13712521 is about 239.3531249340.

The spelling of 13712521 in words is "thirteen million, seven hundred twelve thousand, five hundred twenty-one".