8218708889 has 2 divisors, whose sum is σ = 8218708890. Its totient is φ = 8218708888.

The previous prime is 8218708877. The next prime is 8218708903. The reversal of 8218708889 is 9888078128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7743120025 + 475588864 = 87995^2 + 21808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8218708889 is a prime.

It is a super-2 number, since 2×8218708889² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8218708789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4109354444 + 4109354445.

It is an arithmetic number, because the mean of its divisors is an integer number (4109354445).

Almost surely, 2^8218708889 is an apocalyptic number.

It is an amenable number.

8218708889 is a deficient number, since it is larger than the sum of its proper divisors (1).

8218708889 is an equidigital number, since it uses as much as digits as its factorization.

8218708889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4128768, while the sum is 59.

The square root of 8218708889 is about 90657.0950836171. The cubic root of 8218708889 is about 2018.0621294402.

The spelling of 8218708889 in words is "eight billion, two hundred eighteen million, seven hundred eight thousand, eight hundred eighty-nine".