13881391 has 2 divisors, whose sum is σ = 13881392. Its totient is φ = 13881390.

The previous prime is 13881383. The next prime is 13881407. The reversal of 13881391 is 19318831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13881391 - 2³ = 13881383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13881311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6940695 + 6940696.

It is an arithmetic number, because the mean of its divisors is an integer number (6940696).

Almost surely, 2^13881391 is an apocalyptic number.

13881391 is a deficient number, since it is larger than the sum of its proper divisors (1).

13881391 is an equidigital number, since it uses as much as digits as its factorization.

13881391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 13881391 is about 3725.7738793437. The cubic root of 13881391 is about 240.3316652904.

The spelling of 13881391 in words is "thirteen million, eight hundred eighty-one thousand, three hundred ninety-one".