13344781 has 2 divisors, whose sum is σ = 13344782. Its totient is φ = 13344780.

The previous prime is 13344769. The next prime is 13344791. The reversal of 13344781 is 18744331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12489156 + 855625 = 3534^2 + 925^2 .

It is an emirp because it is prime and its reverse (18744331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13344781 - 2¹¹ = 13342733 is a prime.

It is a super-2 number, since 2×13344781² = 356166359875922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13344791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6672390 + 6672391.

It is an arithmetic number, because the mean of its divisors is an integer number (6672391).

Almost surely, 2^13344781 is an apocalyptic number.

It is an amenable number.

13344781 is a deficient number, since it is larger than the sum of its proper divisors (1).

13344781 is an equidigital number, since it uses as much as digits as its factorization.

13344781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 13344781 is about 3653.0509166996. The cubic root of 13344781 is about 237.1940644348.

The spelling of 13344781 in words is "thirteen million, three hundred forty-four thousand, seven hundred eighty-one".