13881961 has 4 divisors (see below), whose sum is σ = 14025172. Its totient is φ = 13738752.

The previous prime is 13881943. The next prime is 13881977. The reversal of 13881961 is 16918831.

13881961 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16918831 = 2311 ⋅7321.

It can be written as a sum of positive squares in 2 ways, for example, as 1806336 + 12075625 = 1344^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 13881961 - 2⁹ = 13881449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13881961.

It is not an unprimeable number, because it can be changed into a prime (13891961) 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 in 3 ways as a sum of consecutive naturals, for example, 71460 + ... + 71653.

It is an arithmetic number, because the mean of its divisors is an integer number (3506293).

Almost surely, 2^13881961 is an apocalyptic number.

It is an amenable number.

13881961 is a deficient number, since it is larger than the sum of its proper divisors (143211).

13881961 is an equidigital number, since it uses as much as digits as its factorization.

13881961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143210.

The product of its digits is 10368, while the sum is 37.

The square root of 13881961 is about 3725.8503727337. The cubic root of 13881961 is about 240.3349547584.

The spelling of 13881961 in words is "thirteen million, eight hundred eighty-one thousand, nine hundred sixty-one".