16591691 has 2 divisors, whose sum is σ = 16591692. Its totient is φ = 16591690.

The previous prime is 16591669. The next prime is 16591699. The reversal of 16591691 is 19619561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16591691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16591699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8295845 + 8295846.

It is an arithmetic number, because the mean of its divisors is an integer number (8295846).

Almost surely, 2^16591691 is an apocalyptic number.

16591691 is a deficient number, since it is larger than the sum of its proper divisors (1).

16591691 is an equidigital number, since it uses as much as digits as its factorization.

16591691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 38.

The square root of 16591691 is about 4073.2899479413. The cubic root of 16591691 is about 255.0528712618.

The spelling of 16591691 in words is "sixteen million, five hundred ninety-one thousand, six hundred ninety-one".