808619813 has 2 divisors, whose sum is σ = 808619814. Its totient is φ = 808619812.

The previous prime is 808619783. The next prime is 808619831. The reversal of 808619813 is 318916808.

It is a happy number.

Together with next prime (808619831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518837284 + 289782529 = 22778^2 + 17023^2 .

It is a cyclic number.

It is not a de Polignac number, because 808619813 - 2²⁸ = 540184357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (808619863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404309906 + 404309907.

It is an arithmetic number, because the mean of its divisors is an integer number (404309907).

Almost surely, 2^808619813 is an apocalyptic number.

It is an amenable number.

808619813 is a deficient number, since it is larger than the sum of its proper divisors (1).

808619813 is an equidigital number, since it uses as much as digits as its factorization.

808619813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 808619813 is about 28436.2411897213. The cubic root of 808619813 is about 931.6399986962.

The spelling of 808619813 in words is "eight hundred eight million, six hundred nineteen thousand, eight hundred thirteen".