13881817 has 2 divisors, whose sum is σ = 13881818. Its totient is φ = 13881816.

The previous prime is 13881787. The next prime is 13881823. The reversal of 13881817 is 71818831.

13881817 is digitally balanced in base 3, 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., 11703241 + 2178576 = 3421^2 + 1476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13881817 is a prime.

It is not a weakly prime, because it can be changed into another prime (13881017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6940908 + 6940909.

It is an arithmetic number, because the mean of its divisors is an integer number (6940909).

Almost surely, 2^13881817 is an apocalyptic number.

It is an amenable number.

13881817 is a deficient number, since it is larger than the sum of its proper divisors (1).

13881817 is an equidigital number, since it uses as much as digits as its factorization.

13881817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 37.

The square root of 13881817 is about 3725.8310482361. The cubic root of 13881817 is about 240.3341237434.

The spelling of 13881817 in words is "thirteen million, eight hundred eighty-one thousand, eight hundred seventeen".