13556161 has 4 divisors (see below), whose sum is σ = 13625172. Its totient is φ = 13487152.

The previous prime is 13556143. The next prime is 13556167. The reversal of 13556161 is 16165531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16165531 = 131 ⋅123401.

It can be written as a sum of positive squares in 2 ways, for example, as 13359025 + 197136 = 3655^2 + 444^2 .

It is a cyclic number.

It is not a de Polignac number, because 13556161 - 2⁷ = 13556033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13556167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34210 + ... + 34603.

It is an arithmetic number, because the mean of its divisors is an integer number (3406293).

Almost surely, 2^13556161 is an apocalyptic number.

It is an amenable number.

13556161 is a deficient number, since it is larger than the sum of its proper divisors (69011).

13556161 is an equidigital number, since it uses as much as digits as its factorization.

13556161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69010.

The product of its digits is 2700, while the sum is 28.

The square root of 13556161 is about 3681.8692263577. The cubic root of 13556161 is about 238.4398862835.

The spelling of 13556161 in words is "thirteen million, five hundred fifty-six thousand, one hundred sixty-one".