804812191 has 2 divisors, whose sum is σ = 804812192. Its totient is φ = 804812190.

The previous prime is 804812167. The next prime is 804812219. The reversal of 804812191 is 191218408.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 804812191 - 2¹¹ = 804810143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (804812131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402406095 + 402406096.

It is an arithmetic number, because the mean of its divisors is an integer number (402406096).

Almost surely, 2^804812191 is an apocalyptic number.

804812191 is a deficient number, since it is larger than the sum of its proper divisors (1).

804812191 is an equidigital number, since it uses as much as digits as its factorization.

804812191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 804812191 is about 28369.2120264205. The cubic root of 804812191 is about 930.1753979889.

The spelling of 804812191 in words is "eight hundred four million, eight hundred twelve thousand, one hundred ninety-one".