12378161 has 2 divisors, whose sum is σ = 12378162. Its totient is φ = 12378160.

The previous prime is 12378151. The next prime is 12378167. The reversal of 12378161 is 16187321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8151025 + 4227136 = 2855^2 + 2056^2 .

It is an emirp because it is prime and its reverse (16187321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12378161 is a prime.

It is not a weakly prime, because it can be changed into another prime (12378167) 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 as a sum of consecutive naturals, namely, 6189080 + 6189081.

It is an arithmetic number, because the mean of its divisors is an integer number (6189081).

Almost surely, 2^12378161 is an apocalyptic number.

It is an amenable number.

12378161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12378161 is an equidigital number, since it uses as much as digits as its factorization.

12378161 is an odious number, because the sum of its binary digits is odd.

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

The square root of 12378161 is about 3518.2610761568. The cubic root of 12378161 is about 231.3229430471.

The spelling of 12378161 in words is "twelve million, three hundred seventy-eight thousand, one hundred sixty-one".