13391991649 has 2 divisors, whose sum is σ = 13391991650. Its totient is φ = 13391991648.

The previous prime is 13391991643. The next prime is 13391991659. The reversal of 13391991649 is 94619919331.

It is a happy number.

13391991649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13361741649 + 30250000 = 115593^2 + 5500^2 .

It is a cyclic number.

It is not a de Polignac number, because 13391991649 - 2⁵ = 13391991617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13391991649.

It is not a weakly prime, because it can be changed into another prime (13391991643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6695995824 + 6695995825.

It is an arithmetic number, because the mean of its divisors is an integer number (6695995825).

Almost surely, 2^13391991649 is an apocalyptic number.

It is an amenable number.

13391991649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13391991649 is an equidigital number, since it uses as much as digits as its factorization.

13391991649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1417176, while the sum is 55.

The spelling of 13391991649 in words is "thirteen billion, three hundred ninety-one million, nine hundred ninety-one thousand, six hundred forty-nine".