12478681 has 2 divisors, whose sum is σ = 12478682. Its totient is φ = 12478680.

The previous prime is 12478679. The next prime is 12478699. The reversal of 12478681 is 18687421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 291600 = 3491^2 + 540^2 .

It is a cyclic number.

It is not a de Polignac number, because 12478681 - 2¹ = 12478679 is a prime.

It is a super-2 number, since 2×12478681² = 311434958999522, which contains 22 as substring.

Together with 12478679, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12478681.

It is not a weakly prime, because it can be changed into another prime (12478981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6239340 + 6239341.

It is an arithmetic number, because the mean of its divisors is an integer number (6239341).

Almost surely, 2^12478681 is an apocalyptic number.

12478681 is the 2040-th hex number.

It is an amenable number.

12478681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12478681 is an equidigital number, since it uses as much as digits as its factorization.

12478681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 37.

The square root of 12478681 is about 3532.5176574223. The cubic root of 12478681 is about 231.9474278917.

The spelling of 12478681 in words is "twelve million, four hundred seventy-eight thousand, six hundred eighty-one".