808118721 has 16 divisors (see below), whose sum is σ = 1204844800. Its totient is φ = 535311504.

The previous prime is 808118699. The next prime is 808118743. The reversal of 808118721 is 127811808.

It is an interprime number because it is at equal distance from previous prime (808118699) and next prime (808118743).

It is not a de Polignac number, because 808118721 - 2⁶ = 808118657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (808118761) 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 in 15 ways as a sum of consecutive naturals, for example, 91081 + ... + 99558.

It is an arithmetic number, because the mean of its divisors is an integer number (75302800).

Almost surely, 2^808118721 is an apocalyptic number.

It is an amenable number.

808118721 is a deficient number, since it is larger than the sum of its proper divisors (396726079).

808118721 is a wasteful number, since it uses less digits than its factorization.

808118721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190805 (or 190799 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 36.

The square root of 808118721 is about 28427.4290255028. The cubic root of 808118721 is about 931.4475168866.

The spelling of 808118721 in words is "eight hundred eight million, one hundred eighteen thousand, seven hundred twenty-one".