12555649 has 2 divisors, whose sum is σ = 12555650. Its totient is φ = 12555648.

The previous prime is 12555643. The next prime is 12555667. The reversal of 12555649 is 94655521.

12555649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10400625 + 2155024 = 3225^2 + 1468^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12555649 is a prime.

It is a super-2 number, since 2×12555649² = 315288643622402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12555643) 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, 6277824 + 6277825.

It is an arithmetic number, because the mean of its divisors is an integer number (6277825).

Almost surely, 2^12555649 is an apocalyptic number.

It is an amenable number.

12555649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555649 is an equidigital number, since it uses as much as digits as its factorization.

12555649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 37.

The square root of 12555649 is about 3543.3951233245. The cubic root of 12555649 is about 232.4233315636.

It can be divided in two parts, 1255 and 5649, that multiplied together give a triangular number (7089495 = T₃₇₆₅).

The spelling of 12555649 in words is "twelve million, five hundred fifty-five thousand, six hundred forty-nine".