12738161 has 4 divisors (see below), whose sum is σ = 12779172. Its totient is φ = 12697152.

The previous prime is 12738157. The next prime is 12738169. The reversal of 12738161 is 16183721.

12738161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16183721 = 409 ⋅39569.

It can be written as a sum of positive squares in 2 ways, for example, as 93025 + 12645136 = 305^2 + 3556^2 .

It is a cyclic number.

It is not a de Polignac number, because 12738161 - 2² = 12738157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12738169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20036 + ... + 20661.

It is an arithmetic number, because the mean of its divisors is an integer number (3194793).

Almost surely, 2^12738161 is an apocalyptic number.

It is an amenable number.

12738161 is a deficient number, since it is larger than the sum of its proper divisors (41011).

12738161 is an equidigital number, since it uses as much as digits as its factorization.

12738161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41010.

The product of its digits is 2016, while the sum is 29.

The square root of 12738161 is about 3569.0560376660. The cubic root of 12738161 is about 233.5441059213.

The spelling of 12738161 in words is "twelve million, seven hundred thirty-eight thousand, one hundred sixty-one".