12456161 has 4 divisors (see below), whose sum is σ = 12792852. Its totient is φ = 12119472.

The previous prime is 12456151. The next prime is 12456163. The reversal of 12456161 is 16165421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16165421 = 271 ⋅59651.

It can be written as a sum of positive squares in 2 ways, for example, as 6599761 + 5856400 = 2569^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 12456161 - 2⁶ = 12456097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12456161.

It is not an unprimeable number, because it can be changed into a prime (12456163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168290 + ... + 168363.

It is an arithmetic number, because the mean of its divisors is an integer number (3198213).

Almost surely, 2^12456161 is an apocalyptic number.

It is an amenable number.

12456161 is a deficient number, since it is larger than the sum of its proper divisors (336691).

12456161 is an equidigital number, since it uses as much as digits as its factorization.

12456161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336690.

The product of its digits is 1440, while the sum is 26.

The square root of 12456161 is about 3529.3286897086. The cubic root of 12456161 is about 231.8078137383.

The spelling of 12456161 in words is "twelve million, four hundred fifty-six thousand, one hundred sixty-one".