16805491 has 8 divisors (see below), whose sum is σ = 17069904. Its totient is φ = 16543200.

The previous prime is 16805447. The next prime is 16805513. The reversal of 16805491 is 19450861.

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

It is a cyclic number.

It is not a de Polignac number, because 16805491 - 2⁹ = 16804979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16805431) 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 7 ways as a sum of consecutive naturals, for example, 22561 + ... + 23293.

It is an arithmetic number, because the mean of its divisors is an integer number (2133738).

Almost surely, 2^16805491 is an apocalyptic number.

16805491 is a deficient number, since it is larger than the sum of its proper divisors (264413).

16805491 is a wasteful number, since it uses less digits than its factorization.

16805491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 16805491 is about 4099.4500850724. The cubic root of 16805491 is about 256.1437333715.

The spelling of 16805491 in words is "sixteen million, eight hundred five thousand, four hundred ninety-one".