16906691 has 2 divisors, whose sum is σ = 16906692. Its totient is φ = 16906690.

The previous prime is 16906661. The next prime is 16906717. The reversal of 16906691 is 19660961.

It is a strong prime.

It is an emirp because it is prime and its reverse (19660961) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16906691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16906601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8453345 + 8453346.

It is an arithmetic number, because the mean of its divisors is an integer number (8453346).

Almost surely, 2^16906691 is an apocalyptic number.

16906691 is a deficient number, since it is larger than the sum of its proper divisors (1).

16906691 is an equidigital number, since it uses as much as digits as its factorization.

16906691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 16906691 is about 4111.7746776787. The cubic root of 16906691 is about 256.6568570678.

The spelling of 16906691 in words is "sixteen million, nine hundred six thousand, six hundred ninety-one".