800865047 has 2 divisors, whose sum is σ = 800865048. Its totient is φ = 800865046.

The previous prime is 800865001. The next prime is 800865061. The reversal of 800865047 is 740568008.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 800865047 - 2¹⁶ = 800799511 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 800865047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (800865547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400432523 + 400432524.

It is an arithmetic number, because the mean of its divisors is an integer number (400432524).

Almost surely, 2^800865047 is an apocalyptic number.

800865047 is a deficient number, since it is larger than the sum of its proper divisors (1).

800865047 is an equidigital number, since it uses as much as digits as its factorization.

800865047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 800865047 is about 28299.5591308416. The cubic root of 800865047 is about 928.6522455679.

The spelling of 800865047 in words is "eight hundred million, eight hundred sixty-five thousand, forty-seven".