16719691 has 2 divisors, whose sum is σ = 16719692. Its totient is φ = 16719690.

The previous prime is 16719679. The next prime is 16719697. The reversal of 16719691 is 19691761.

It is a strong prime.

It is an emirp because it is prime and its reverse (19691761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16719691 - 2⁹ = 16719179 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16719697) 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 as a sum of consecutive naturals, namely, 8359845 + 8359846.

It is an arithmetic number, because the mean of its divisors is an integer number (8359846).

Almost surely, 2^16719691 is an apocalyptic number.

16719691 is a deficient number, since it is larger than the sum of its proper divisors (1).

16719691 is an equidigital number, since it uses as much as digits as its factorization.

16719691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 40.

The square root of 16719691 is about 4088.9718756675. The cubic root of 16719691 is about 255.7070776777.

The spelling of 16719691 in words is "sixteen million, seven hundred nineteen thousand, six hundred ninety-one".