16500091 has 4 divisors (see below), whose sum is σ = 17032384. Its totient is φ = 15967800.

The previous prime is 16500083. The next prime is 16500097. The reversal of 16500091 is 19000561.

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 16500091 - 2³ = 16500083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16500097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266100 + ... + 266161.

It is an arithmetic number, because the mean of its divisors is an integer number (4258096).

Almost surely, 2^16500091 is an apocalyptic number.

16500091 is a deficient number, since it is larger than the sum of its proper divisors (532293).

16500091 is an equidigital number, since it uses as much as digits as its factorization.

16500091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532292.

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

The square root of 16500091 is about 4062.0304036282. The cubic root of 16500091 is about 254.5826365019.

The spelling of 16500091 in words is "sixteen million, five hundred thousand, ninety-one".