16999 has 4 divisors (see below), whose sum is σ = 17280. Its totient is φ = 16720.

The previous prime is 16993. The next prime is 17011. The reversal of 16999 is 99961.

It is a happy number.

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 16999 - 2⁷ = 16871 is a prime.

It is a Canada number.

It is a Duffinian number.

16999 is a modest number, since divided by 999 gives 16 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7 + ... + 184.

It is an arithmetic number, because the mean of its divisors is an integer number (4320).

2¹⁶⁹⁹⁹ is an apocalyptic number.

16999 is a deficient number, since it is larger than the sum of its proper divisors (281).

16999 is an equidigital number, since it uses as much as digits as its factorization.

16999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280.

The product of its digits is 4374, while the sum is 34.

The square root of 16999 is about 130.3802132227. The cubic root of 16999 is about 25.7123117238.

The spelling of 16999 in words is "sixteen thousand, nine hundred ninety-nine".