808863904391 has 2 divisors, whose sum is σ = 808863904392. Its totient is φ = 808863904390.

The previous prime is 808863904369. The next prime is 808863904393. The reversal of 808863904391 is 193409368808.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-808863904391 is a prime.

Together with 808863904393, it forms a pair of twin primes.

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 808863904391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (808863904393) 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, 404431952195 + 404431952196.

It is an arithmetic number, because the mean of its divisors is an integer number (404431952196).

Almost surely, 2^808863904391 is an apocalyptic number.

808863904391 is a deficient number, since it is larger than the sum of its proper divisors (1).

808863904391 is an equidigital number, since it uses as much as digits as its factorization.

808863904391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8957952, while the sum is 59.

The spelling of 808863904391 in words is "eight hundred eight billion, eight hundred sixty-three million, nine hundred four thousand, three hundred ninety-one".