13911 has 4 divisors (see below), whose sum is σ = 18552. Its totient is φ = 9272.

The previous prime is 13907. The next prime is 13913. The reversal of 13911 is 11931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13911 - 2² = 13907 is a prime.

It is a D-number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 13911.

It is not an unprimeable number, because it can be changed into a prime (13913) 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, 2316 + ... + 2321.

It is an arithmetic number, because the mean of its divisors is an integer number (4638).

2¹³⁹¹¹ is an apocalyptic number.

13911 is a deficient number, since it is larger than the sum of its proper divisors (4641).

13911 is an equidigital number, since it uses as much as digits as its factorization.

13911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4640.

The product of its digits is 27, while the sum is 15.

The square root of 13911 is about 117.9449023909. The cubic root of 13911 is about 24.0502419715.

The spelling of 13911 in words is "thirteen thousand, nine hundred eleven".