9818881 has 2 divisors, whose sum is σ = 9818882. Its totient is φ = 9818880.

The previous prime is 9818873. The next prime is 9818891. The reversal of 9818881 is 1888189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8850625 + 968256 = 2975^2 + 984^2 .

It is an emirp because it is prime and its reverse (1888189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9818881 - 2³ = 9818873 is a prime.

It is a super-2 number, since 2×9818881² = 192820848184322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9818891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4909440 + 4909441.

It is an arithmetic number, because the mean of its divisors is an integer number (4909441).

Almost surely, 2^9818881 is an apocalyptic number.

It is an amenable number.

9818881 is a deficient number, since it is larger than the sum of its proper divisors (1).

9818881 is an equidigital number, since it uses as much as digits as its factorization.

9818881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 43.

The square root of 9818881 is about 3133.5093744873. The cubic root of 9818881 is about 214.1348394686.

The spelling of 9818881 in words is "nine million, eight hundred eighteen thousand, eight hundred eighty-one".