14991 has 8 divisors (see below), whose sum is σ = 21120. Its totient is φ = 9432.

The previous prime is 14983. The next prime is 15013. The reversal of 14991 is 19941.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 14991 - 2³ = 14983 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75 + ... + 188.

It is an arithmetic number, because the mean of its divisors is an integer number (2640).

2¹⁴⁹⁹¹ is an apocalyptic number.

14991 is a deficient number, since it is larger than the sum of its proper divisors (6129).

14991 is a wasteful number, since it uses less digits than its factorization.

14991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285.

The product of its digits is 324, while the sum is 24.

The square root of 14991 is about 122.4377392800. The cubic root of 14991 is about 24.6571873323.

Subtracting 14991 from its reverse (19941), we obtain a triangular number (4950 = T₉₉).

The spelling of 14991 in words is "fourteen thousand, nine hundred ninety-one".