13881361 has 4 divisors (see below), whose sum is σ = 14949172. Its totient is φ = 12813552.

The previous prime is 13881337. The next prime is 13881377. The reversal of 13881361 is 16318831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16318831 = 977 ⋅16703.

It can be written as a sum of positive squares in 2 ways, for example, as 6990736 + 6890625 = 2644^2 + 2625^2 .

It is a cyclic number.

It is not a de Polignac number, because 13881361 - 2⁷ = 13881233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13881311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533886 + ... + 533911.

It is an arithmetic number, because the mean of its divisors is an integer number (3737293).

Almost surely, 2^13881361 is an apocalyptic number.

It is an amenable number.

13881361 is a deficient number, since it is larger than the sum of its proper divisors (1067811).

13881361 is a wasteful number, since it uses less digits than its factorization.

13881361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067810.

The product of its digits is 3456, while the sum is 31.

The square root of 13881361 is about 3725.7698533323. The cubic root of 13881361 is about 240.3314921580.

The spelling of 13881361 in words is "thirteen million, eight hundred eighty-one thousand, three hundred sixty-one".