12678517 has 2 divisors, whose sum is σ = 12678518. Its totient is φ = 12678516.

The previous prime is 12678509. The next prime is 12678527. The reversal of 12678517 is 71587621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12453841 + 224676 = 3529^2 + 474^2 .

It is a cyclic number.

It is not a de Polignac number, because 12678517 - 2³ = 12678509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12678527) 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 as a sum of consecutive naturals, namely, 6339258 + 6339259.

It is an arithmetic number, because the mean of its divisors is an integer number (6339259).

Almost surely, 2^12678517 is an apocalyptic number.

It is an amenable number.

12678517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12678517 is an equidigital number, since it uses as much as digits as its factorization.

12678517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 37.

The square root of 12678517 is about 3560.6905229183. The cubic root of 12678517 is about 233.1790270027.

The spelling of 12678517 in words is "twelve million, six hundred seventy-eight thousand, five hundred seventeen".