13607521 has 2 divisors, whose sum is σ = 13607522. Its totient is φ = 13607520.

The previous prime is 13607519. The next prime is 13607533. The reversal of 13607521 is 12570631.

13607521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8767521 + 4840000 = 2961^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 13607521 - 2¹ = 13607519 is a prime.

Together with 13607519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13607551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6803760 + 6803761.

It is an arithmetic number, because the mean of its divisors is an integer number (6803761).

Almost surely, 2^13607521 is an apocalyptic number.

It is an amenable number.

13607521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13607521 is an equidigital number, since it uses as much as digits as its factorization.

13607521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 13607521 is about 3688.8373507109. The cubic root of 13607521 is about 238.7406311940.

The spelling of 13607521 in words is "thirteen million, six hundred seven thousand, five hundred twenty-one".