16749891 has 12 divisors (see below), whose sum is σ = 24322168. Its totient is φ = 11107584.

The previous prime is 16749883. The next prime is 16749893. The reversal of 16749891 is 19894761.

It is a happy number.

It is not a de Polignac number, because 16749891 - 2³ = 16749883 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16749893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3085 + ... + 6558.

Almost surely, 2^16749891 is an apocalyptic number.

16749891 is a deficient number, since it is larger than the sum of its proper divisors (7572277).

16749891 is a wasteful number, since it uses less digits than its factorization.

16749891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9842 (or 9839 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 16749891 is about 4092.6630694451. The cubic root of 16749891 is about 255.8609423413.

The spelling of 16749891 in words is "sixteen million, seven hundred forty-nine thousand, eight hundred ninety-one".