16719891 has 16 divisors (see below), whose sum is σ = 23786784. Its totient is φ = 10409984.

The previous prime is 16719889. The next prime is 16719907. The reversal of 16719891 is 19891761.

16719891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16719891 - 2¹ = 16719889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16719811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5791 + ... + 8183.

It is an arithmetic number, because the mean of its divisors is an integer number (1486674).

Almost surely, 2^16719891 is an apocalyptic number.

16719891 is a deficient number, since it is larger than the sum of its proper divisors (7066893).

16719891 is a wasteful number, since it uses less digits than its factorization.

16719891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550.

The product of its digits is 27216, while the sum is 42.

The square root of 16719891 is about 4088.9963316198. The cubic root of 16719891 is about 255.7080972582.

The spelling of 16719891 in words is "sixteen million, seven hundred nineteen thousand, eight hundred ninety-one".