808681 has 2 divisors, whose sum is σ = 808682. Its totient is φ = 808680.

The previous prime is 808679. The next prime is 808693. The reversal of 808681 is 186808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 781456 + 27225 = 884^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 808681 - 2¹ = 808679 is a prime.

It is a super-2 number, since 2×808681² = 1307929919522, which contains 22 as substring.

Together with 808679, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (808601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404340 + 404341.

It is an arithmetic number, because the mean of its divisors is an integer number (404341).

2⁸⁰⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

808681 is a deficient number, since it is larger than the sum of its proper divisors (1).

808681 is an equidigital number, since it uses as much as digits as its factorization.

808681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 808681 is about 899.2669236662. The cubic root of 808681 is about 93.1663496685.

The spelling of 808681 in words is "eight hundred eight thousand, six hundred eighty-one".