804812891 has 2 divisors, whose sum is σ = 804812892. Its totient is φ = 804812890.

The previous prime is 804812873. The next prime is 804812909. The reversal of 804812891 is 198218408.

It is a balanced prime because it is at equal distance from previous prime (804812873) and next prime (804812909).

It is a cyclic number.

It is not a de Polignac number, because 804812891 - 2¹⁰ = 804811867 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (804812191) 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, 402406445 + 402406446.

It is an arithmetic number, because the mean of its divisors is an integer number (402406446).

Almost surely, 2^804812891 is an apocalyptic number.

804812891 is a deficient number, since it is larger than the sum of its proper divisors (1).

804812891 is an equidigital number, since it uses as much as digits as its factorization.

804812891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 804812891 is about 28369.2243637361. The cubic root of 804812891 is about 930.1756676678.

The spelling of 804812891 in words is "eight hundred four million, eight hundred twelve thousand, eight hundred ninety-one".