13657561 has 8 divisors (see below), whose sum is σ = 15001920. Its totient is φ = 12375792.

The previous prime is 13657547. The next prime is 13657571. The reversal of 13657561 is 16575631.

13657561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 13657561 - 2⁵ = 13657529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13657541) 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, 15190 + ... + 16063.

It is an arithmetic number, because the mean of its divisors is an integer number (1875240).

Almost surely, 2^13657561 is an apocalyptic number.

It is an amenable number.

13657561 is a deficient number, since it is larger than the sum of its proper divisors (1344359).

13657561 is a wasteful number, since it uses less digits than its factorization.

13657561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31295.

The product of its digits is 18900, while the sum is 34.

The square root of 13657561 is about 3695.6137514627. The cubic root of 13657561 is about 239.0329197256.

The spelling of 13657561 in words is "thirteen million, six hundred fifty-seven thousand, five hundred sixty-one".