16990691 has 2 divisors, whose sum is σ = 16990692. Its totient is φ = 16990690.

The previous prime is 16990679. The next prime is 16990703. The reversal of 16990691 is 19609961.

It is a balanced prime because it is at equal distance from previous prime (16990679) and next prime (16990703). It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 16906691 and 19660961.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16990691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16990601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8495345 + 8495346.

It is an arithmetic number, because the mean of its divisors is an integer number (8495346).

Almost surely, 2^16990691 is an apocalyptic number.

16990691 is a deficient number, since it is larger than the sum of its proper divisors (1).

16990691 is an equidigital number, since it uses as much as digits as its factorization.

16990691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 16990691 is about 4121.9765889680. The cubic root of 16990691 is about 257.0812170449.

The spelling of 16990691 in words is "sixteen million, nine hundred ninety thousand, six hundred ninety-one".