13313681 has 2 divisors, whose sum is σ = 13313682. Its totient is φ = 13313680.

The previous prime is 13313647. The next prime is 13313687. The reversal of 13313681 is 18631331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13140625 + 173056 = 3625^2 + 416^2 .

It is an emirp because it is prime and its reverse (18631331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13313681 - 2¹⁰ = 13312657 is a prime.

It is a super-2 number, since 2×13313681² = 354508203539522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13313681.

It is not a weakly prime, because it can be changed into another prime (13313687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6656840 + 6656841.

It is an arithmetic number, because the mean of its divisors is an integer number (6656841).

Almost surely, 2^13313681 is an apocalyptic number.

It is an amenable number.

13313681 is a deficient number, since it is larger than the sum of its proper divisors (1).

13313681 is an equidigital number, since it uses as much as digits as its factorization.

13313681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 13313681 is about 3648.7917178156. The cubic root of 13313681 is about 237.0096609259.

The spelling of 13313681 in words is "thirteen million, three hundred thirteen thousand, six hundred eighty-one".