13668481 has 2 divisors, whose sum is σ = 13668482. Its totient is φ = 13668480.

The previous prime is 13668443. The next prime is 13668497. The reversal of 13668481 is 18486631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 1418481 = 3500^2 + 1191^2 .

It is an emirp because it is prime and its reverse (18486631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13668481 - 2¹⁹ = 13144193 is a prime.

It is a super-2 number, since 2×13668481² = 373654745694722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13668481.

It is not a weakly prime, because it can be changed into another prime (13668881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6834240 + 6834241.

It is an arithmetic number, because the mean of its divisors is an integer number (6834241).

Almost surely, 2^13668481 is an apocalyptic number.

It is an amenable number.

13668481 is a deficient number, since it is larger than the sum of its proper divisors (1).

13668481 is an equidigital number, since it uses as much as digits as its factorization.

13668481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 13668481 is about 3697.0908833839. The cubic root of 13668481 is about 239.0966095776.

The spelling of 13668481 in words is "thirteen million, six hundred sixty-eight thousand, four hundred eighty-one".