808408813 has 2 divisors, whose sum is σ = 808408814. Its totient is φ = 808408812.

The previous prime is 808408781. The next prime is 808408823. The reversal of 808408813 is 318804808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420988324 + 387420489 = 20518^2 + 19683^2 .

It is a cyclic number.

It is not a de Polignac number, because 808408813 - 2⁵ = 808408781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (808408823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404204406 + 404204407.

It is an arithmetic number, because the mean of its divisors is an integer number (404204407).

Almost surely, 2^808408813 is an apocalyptic number.

It is an amenable number.

808408813 is a deficient number, since it is larger than the sum of its proper divisors (1).

808408813 is an equidigital number, since it uses as much as digits as its factorization.

808408813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49152, while the sum is 40.

The square root of 808408813 is about 28432.5308933271. The cubic root of 808408813 is about 931.5589580814.

The spelling of 808408813 in words is "eight hundred eight million, four hundred eight thousand, eight hundred thirteen".