8661841 has 2 divisors, whose sum is σ = 8661842. Its totient is φ = 8661840.

The previous prime is 8661839. The next prime is 8661871. The reversal of 8661841 is 1481668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8532241 + 129600 = 2921^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 8661841 - 2¹ = 8661839 is a prime.

Together with 8661839, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 8661797 and 8661806.

It is not a weakly prime, because it can be changed into another prime (8661871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330920 + 4330921.

It is an arithmetic number, because the mean of its divisors is an integer number (4330921).

Almost surely, 2^8661841 is an apocalyptic number.

It is an amenable number.

8661841 is a deficient number, since it is larger than the sum of its proper divisors (1).

8661841 is an equidigital number, since it uses as much as digits as its factorization.

8661841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 34.

The square root of 8661841 is about 2943.1005759233. The cubic root of 8661841 is about 205.3698735944.

The spelling of 8661841 in words is "eight million, six hundred sixty-one thousand, eight hundred forty-one".