16685091 has 12 divisors (see below), whose sum is σ = 24181768. Its totient is φ = 11085984.

The previous prime is 16685087. The next prime is 16685111. The reversal of 16685091 is 19058661.

It is not a de Polignac number, because 16685091 - 2² = 16685087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16685791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145 + ... + 5778.

Almost surely, 2^16685091 is an apocalyptic number.

16685091 is a deficient number, since it is larger than the sum of its proper divisors (7496677).

16685091 is a wasteful number, since it uses less digits than its factorization.

16685091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6242 (or 6239 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 16685091 is about 4084.7387921384. The cubic root of 16685091 is about 255.5305677381.

The spelling of 16685091 in words is "sixteen million, six hundred eighty-five thousand, ninety-one".