16500109 has 4 divisors (see below), whose sum is σ = 16517116. Its totient is φ = 16483104.

The previous prime is 16500103. The next prime is 16500139. The reversal of 16500109 is 90100561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90100561 = 17 ⋅5300033.

It can be written as a sum of positive squares in 2 ways, for example, as 14478025 + 2022084 = 3805^2 + 1422^2 .

It is a cyclic number.

It is not a de Polignac number, because 16500109 - 2⁹ = 16499597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16500109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16500103) 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, 6954 + ... + 9019.

It is an arithmetic number, because the mean of its divisors is an integer number (4129279).

Almost surely, 2^16500109 is an apocalyptic number.

It is an amenable number.

16500109 is a deficient number, since it is larger than the sum of its proper divisors (17007).

16500109 is a wasteful number, since it uses less digits than its factorization.

16500109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17006.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 16500109 is about 4062.0326192683. The cubic root of 16500109 is about 254.5827290768.

The spelling of 16500109 in words is "sixteen million, five hundred thousand, one hundred nine".