13881649 has 2 divisors, whose sum is σ = 13881650. Its totient is φ = 13881648.

The previous prime is 13881641. The next prime is 13881653. The reversal of 13881649 is 94618831.

13881649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10195249 + 3686400 = 3193^2 + 1920^2 .

It is a cyclic number.

It is not a de Polignac number, because 13881649 - 2³ = 13881641 is a prime.

It is not a weakly prime, because it can be changed into another prime (13881641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6940824 + 6940825.

It is an arithmetic number, because the mean of its divisors is an integer number (6940825).

Almost surely, 2^13881649 is an apocalyptic number.

It is an amenable number.

13881649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13881649 is an equidigital number, since it uses as much as digits as its factorization.

13881649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 13881649 is about 3725.8085028622. The cubic root of 13881649 is about 240.3331542186. Note that the first 3 decimals are identical.

The spelling of 13881649 in words is "thirteen million, eight hundred eighty-one thousand, six hundred forty-nine".