12655997 has 2 divisors, whose sum is σ = 12655998. Its totient is φ = 12655996.

The previous prime is 12655969. The next prime is 12655999. The reversal of 12655997 is 79955621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8375236 + 4280761 = 2894^2 + 2069^2 .

It is a cyclic number.

It is not a de Polignac number, because 12655997 - 2⁶ = 12655933 is a prime.

Together with 12655999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12655999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6327998 + 6327999.

It is an arithmetic number, because the mean of its divisors is an integer number (6327999).

Almost surely, 2^12655997 is an apocalyptic number.

It is an amenable number.

12655997 is a deficient number, since it is larger than the sum of its proper divisors (1).

12655997 is an equidigital number, since it uses as much as digits as its factorization.

12655997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170100, while the sum is 44.

The square root of 12655997 is about 3557.5268094563. The cubic root of 12655997 is about 233.0408850872.

The spelling of 12655997 in words is "twelve million, six hundred fifty-five thousand, nine hundred ninety-seven".