9866881 has 2 divisors, whose sum is σ = 9866882. Its totient is φ = 9866880.

The previous prime is 9866867. The next prime is 9866887. The reversal of 9866881 is 1886689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8071281 + 1795600 = 2841^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 9866881 - 2⁵ = 9866849 is a prime.

It is a super-2 number, since 2×9866881² = 194710681336322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9866887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4933440 + 4933441.

It is an arithmetic number, because the mean of its divisors is an integer number (4933441).

Almost surely, 2^9866881 is an apocalyptic number.

It is an amenable number.

9866881 is a deficient number, since it is larger than the sum of its proper divisors (1).

9866881 is an equidigital number, since it uses as much as digits as its factorization.

9866881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 46.

The square root of 9866881 is about 3141.1591809394. The cubic root of 9866881 is about 214.4832080428.

It can be divided in two parts, 986688 and 1, that added together give a palindrome (986689).

The spelling of 9866881 in words is "nine million, eight hundred sixty-six thousand, eight hundred eighty-one".