13056661 has 2 divisors, whose sum is σ = 13056662. Its totient is φ = 13056660.

The previous prime is 13056653. The next prime is 13056677. The reversal of 13056661 is 16665031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8352100 + 4704561 = 2890^2 + 2169^2 .

It is a cyclic number.

It is not a de Polignac number, because 13056661 - 2³ = 13056653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13056601) 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, 6528330 + 6528331.

It is an arithmetic number, because the mean of its divisors is an integer number (6528331).

Almost surely, 2^13056661 is an apocalyptic number.

It is an amenable number.

13056661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13056661 is an equidigital number, since it uses as much as digits as its factorization.

13056661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 13056661 is about 3613.4001992583. The cubic root of 13056661 is about 235.4745864153.

The spelling of 13056661 in words is "thirteen million, fifty-six thousand, six hundred sixty-one".