16717691 has 2 divisors, whose sum is σ = 16717692. Its totient is φ = 16717690.

The previous prime is 16717661. The next prime is 16717693. The reversal of 16717691 is 19671761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16717691 - 2¹⁸ = 16455547 is a prime.

Together with 16717693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16717693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8358845 + 8358846.

It is an arithmetic number, because the mean of its divisors is an integer number (8358846).

Almost surely, 2^16717691 is an apocalyptic number.

16717691 is a deficient number, since it is larger than the sum of its proper divisors (1).

16717691 is an equidigital number, since it uses as much as digits as its factorization.

16717691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 38.

The square root of 16717691 is about 4088.7273080997. The cubic root of 16717691 is about 255.6968814257.

The spelling of 16717691 in words is "sixteen million, seven hundred seventeen thousand, six hundred ninety-one".