13911649 has 2 divisors, whose sum is σ = 13911650. Its totient is φ = 13911648.

The previous prime is 13911647. The next prime is 13911659. The reversal of 13911649 is 94611931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7317025 + 6594624 = 2705^2 + 2568^2 .

It is an emirp because it is prime and its reverse (94611931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13911649 - 2¹ = 13911647 is a prime.

Together with 13911647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13911641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6955824 + 6955825.

It is an arithmetic number, because the mean of its divisors is an integer number (6955825).

Almost surely, 2^13911649 is an apocalyptic number.

It is an amenable number.

13911649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13911649 is an equidigital number, since it uses as much as digits as its factorization.

13911649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 34.

The square root of 13911649 is about 3729.8323018602. The cubic root of 13911649 is about 240.5061597684.

The spelling of 13911649 in words is "thirteen million, nine hundred eleven thousand, six hundred forty-nine".