13318649 has 2 divisors, whose sum is σ = 13318650. Its totient is φ = 13318648.

The previous prime is 13318619. The next prime is 13318661. The reversal of 13318649 is 94681331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12996025 + 322624 = 3605^2 + 568^2 .

It is an emirp because it is prime and its reverse (94681331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13318649 is a prime.

It is a super-2 number, since 2×13318649² = 354772822370402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13318619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6659324 + 6659325.

It is an arithmetic number, because the mean of its divisors is an integer number (6659325).

Almost surely, 2^13318649 is an apocalyptic number.

It is an amenable number.

13318649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13318649 is an equidigital number, since it uses as much as digits as its factorization.

13318649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 13318649 is about 3649.4724276257. The cubic root of 13318649 is about 237.0391373111.

The spelling of 13318649 in words is "thirteen million, three hundred eighteen thousand, six hundred forty-nine".