12578161 has 2 divisors, whose sum is σ = 12578162. Its totient is φ = 12578160.

The previous prime is 12578131. The next prime is 12578173. The reversal of 12578161 is 16187521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12559936 + 18225 = 3544^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 12578161 - 2⁵ = 12578129 is a prime.

It is not a weakly prime, because it can be changed into another prime (12578101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6289080 + 6289081.

It is an arithmetic number, because the mean of its divisors is an integer number (6289081).

Almost surely, 2^12578161 is an apocalyptic number.

It is an amenable number.

12578161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12578161 is an equidigital number, since it uses as much as digits as its factorization.

12578161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 31.

The square root of 12578161 is about 3546.5703151073. The cubic root of 12578161 is about 232.5621585838.

The spelling of 12578161 in words is "twelve million, five hundred seventy-eight thousand, one hundred sixty-one".