16805891 has 2 divisors, whose sum is σ = 16805892. Its totient is φ = 16805890.

The previous prime is 16805879. The next prime is 16805903. The reversal of 16805891 is 19850861.

It is a balanced prime because it is at equal distance from previous prime (16805879) and next prime (16805903).

It is a cyclic number.

It is not a de Polignac number, because 16805891 - 2⁶ = 16805827 is a prime.

It is not a weakly prime, because it can be changed into another prime (16805851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8402945 + 8402946.

It is an arithmetic number, because the mean of its divisors is an integer number (8402946).

Almost surely, 2^16805891 is an apocalyptic number.

16805891 is a deficient number, since it is larger than the sum of its proper divisors (1).

16805891 is an equidigital number, since it uses as much as digits as its factorization.

16805891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 16805891 is about 4099.4988718135. The cubic root of 16805891 is about 256.1457655779.

The spelling of 16805891 in words is "sixteen million, eight hundred five thousand, eight hundred ninety-one".