12973661 has 2 divisors, whose sum is σ = 12973662. Its totient is φ = 12973660.

The previous prime is 12973651. The next prime is 12973699. The reversal of 12973661 is 16637921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12208036 + 765625 = 3494^2 + 875^2 .

It is an emirp because it is prime and its reverse (16637921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12973661 - 2¹⁰ = 12972637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12973651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6486830 + 6486831.

It is an arithmetic number, because the mean of its divisors is an integer number (6486831).

Almost surely, 2^12973661 is an apocalyptic number.

It is an amenable number.

12973661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12973661 is an equidigital number, since it uses as much as digits as its factorization.

12973661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 12973661 is about 3601.8968613773. The cubic root of 12973661 is about 234.9745619062.

The spelling of 12973661 in words is "twelve million, nine hundred seventy-three thousand, six hundred sixty-one".