16109 has 4 divisors (see below), whose sum is σ = 16380. Its totient is φ = 15840.

The previous prime is 16103. The next prime is 16111. The reversal of 16109 is 90161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90161 = 29 ⋅3109.

It can be written as a sum of positive squares in 2 ways, for example, as 1225 + 14884 = 35^2 + 122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16109 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16103) 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, 2 + ... + 179.

It is an arithmetic number, because the mean of its divisors is an integer number (4095).

2¹⁶¹⁰⁹ is an apocalyptic number.

It is an amenable number.

16109 is a deficient number, since it is larger than the sum of its proper divisors (271).

16109 is an equidigital number, since it uses as much as digits as its factorization.

16109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 16109 is about 126.9212354179. The cubic root of 16109 is about 25.2555129615.

It can be divided in two parts, 16 and 109, that added together give a cube (125 = 5³).

The spelling of 16109 in words is "sixteen thousand, one hundred nine".