13648561 has 2 divisors, whose sum is σ = 13648562. Its totient is φ = 13648560.

The previous prime is 13648559. The next prime is 13648577. The reversal of 13648561 is 16584631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9728161 + 3920400 = 3119^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 13648561 - 2¹ = 13648559 is a prime.

Together with 13648559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13648511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6824280 + 6824281.

It is an arithmetic number, because the mean of its divisors is an integer number (6824281).

Almost surely, 2^13648561 is an apocalyptic number.

It is an amenable number.

13648561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13648561 is an equidigital number, since it uses as much as digits as its factorization.

13648561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 13648561 is about 3694.3958910761. The cubic root of 13648561 is about 238.9804025644.

The spelling of 13648561 in words is "thirteen million, six hundred forty-eight thousand, five hundred sixty-one".