16805851 has 2 divisors, whose sum is σ = 16805852. Its totient is φ = 16805850.

The previous prime is 16805849. The next prime is 16805869. The reversal of 16805851 is 15850861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16805851 - 2¹ = 16805849 is a prime.

Together with 16805849, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16805891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8402925 + 8402926.

It is an arithmetic number, because the mean of its divisors is an integer number (8402926).

Almost surely, 2^16805851 is an apocalyptic number.

16805851 is a deficient number, since it is larger than the sum of its proper divisors (1).

16805851 is an equidigital number, since it uses as much as digits as its factorization.

16805851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 16805851 is about 4099.4939931655. The cubic root of 16805851 is about 256.1455623587.

The spelling of 16805851 in words is "sixteen million, eight hundred five thousand, eight hundred fifty-one".