13968561 has 4 divisors (see below), whose sum is σ = 18624752. Its totient is φ = 9312372.

The previous prime is 13968547. The next prime is 13968571. The reversal of 13968561 is 16586931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13968561 - 2⁹ = 13968049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13968571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2328091 + ... + 2328096.

It is an arithmetic number, because the mean of its divisors is an integer number (4656188).

Almost surely, 2^13968561 is an apocalyptic number.

It is an amenable number.

13968561 is a deficient number, since it is larger than the sum of its proper divisors (4656191).

13968561 is an equidigital number, since it uses as much as digits as its factorization.

13968561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656190.

The product of its digits is 38880, while the sum is 39.

The square root of 13968561 is about 3737.4538124236. The cubic root of 13968561 is about 240.8336805775.

The spelling of 13968561 in words is "thirteen million, nine hundred sixty-eight thousand, five hundred sixty-one".