13557561 has 8 divisors (see below), whose sum is σ = 18185664. Its totient is φ = 8983920.

The previous prime is 13557553. The next prime is 13557569. The reversal of 13557561 is 16575531.

It is an interprime number because it is at equal distance from previous prime (13557553) and next prime (13557569).

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

It is not a de Polignac number, because 13557561 - 2³ = 13557553 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (13557569) 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, 13030 + ... + 14031.

It is an arithmetic number, because the mean of its divisors is an integer number (2273208).

Almost surely, 2^13557561 is an apocalyptic number.

It is an amenable number.

13557561 is a deficient number, since it is larger than the sum of its proper divisors (4628103).

13557561 is a wasteful number, since it uses less digits than its factorization.

13557561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27231.

The product of its digits is 15750, while the sum is 33.

The square root of 13557561 is about 3682.0593422703. The cubic root of 13557561 is about 238.4480942206.

The spelling of 13557561 in words is "thirteen million, five hundred fifty-seven thousand, five hundred sixty-one".