13968281 has 2 divisors, whose sum is σ = 13968282. Its totient is φ = 13968280.

The previous prime is 13968239. The next prime is 13968289. The reversal of 13968281 is 18286931.

13968281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13756681 + 211600 = 3709^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 13968281 - 2⁶ = 13968217 is a prime.

It is a super-2 number, since 2×13968281² = 390225748189922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13968289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6984140 + 6984141.

It is an arithmetic number, because the mean of its divisors is an integer number (6984141).

Almost surely, 2^13968281 is an apocalyptic number.

It is an amenable number.

13968281 is a deficient number, since it is larger than the sum of its proper divisors (1).

13968281 is an equidigital number, since it uses as much as digits as its factorization.

13968281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 13968281 is about 3737.4163535790. The cubic root of 13968281 is about 240.8320713953.

It can be divided in two parts, 13 and 968281, that multiplied together give a triangular number (12587653 = T₅₀₁₇).

The spelling of 13968281 in words is "thirteen million, nine hundred sixty-eight thousand, two hundred eighty-one".