8666881 has 2 divisors, whose sum is σ = 8666882. Its totient is φ = 8666880.

The previous prime is 8666863. The next prime is 8666891. The reversal of 8666881 is 1886668.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4730625 + 3936256 = 2175^2 + 1984^2 .

It is a cyclic number.

It is not a de Polignac number, because 8666881 - 2⁵ = 8666849 is a prime.

It is a super-2 number, since 2×8666881² = 150229652536322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8666891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4333440 + 4333441.

It is an arithmetic number, because the mean of its divisors is an integer number (4333441).

Almost surely, 2^8666881 is an apocalyptic number.

It is an amenable number.

8666881 is a deficient number, since it is larger than the sum of its proper divisors (1).

8666881 is an equidigital number, since it uses as much as digits as its factorization.

8666881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 43.

The square root of 8666881 is about 2943.9566912575. The cubic root of 8666881 is about 205.4096982103.

The spelling of 8666881 in words is "eight million, six hundred sixty-six thousand, eight hundred eighty-one".