804888391 has 2 divisors, whose sum is σ = 804888392. Its totient is φ = 804888390.

The previous prime is 804888389. The next prime is 804888449. The reversal of 804888391 is 193888408.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 804888391 - 2¹ = 804888389 is a prime.

Together with 804888389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (804888311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402444195 + 402444196.

It is an arithmetic number, because the mean of its divisors is an integer number (402444196).

Almost surely, 2^804888391 is an apocalyptic number.

804888391 is a deficient number, since it is larger than the sum of its proper divisors (1).

804888391 is an equidigital number, since it uses as much as digits as its factorization.

804888391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 442368, while the sum is 49.

The square root of 804888391 is about 28370.5549998586. The cubic root of 804888391 is about 930.2047535451.

The spelling of 804888391 in words is "eight hundred four million, eight hundred eighty-eight thousand, three hundred ninety-one".