12681397 has 2 divisors, whose sum is σ = 12681398. Its totient is φ = 12681396.

The previous prime is 12681391. The next prime is 12681407. The reversal of 12681397 is 79318621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12680721 + 676 = 3561^2 + 26^2 .

It is an emirp because it is prime and its reverse (79318621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12681397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12681391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6340698 + 6340699.

It is an arithmetic number, because the mean of its divisors is an integer number (6340699).

Almost surely, 2^12681397 is an apocalyptic number.

It is an amenable number.

12681397 is a deficient number, since it is larger than the sum of its proper divisors (1).

12681397 is an equidigital number, since it uses as much as digits as its factorization.

12681397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 12681397 is about 3561.0949158931. The cubic root of 12681397 is about 233.1966816636.

The spelling of 12681397 in words is "twelve million, six hundred eighty-one thousand, three hundred ninety-seven".