8669861 has 2 divisors, whose sum is σ = 8669862. Its totient is φ = 8669860.

The previous prime is 8669831. The next prime is 8669879. The reversal of 8669861 is 1689668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7392961 + 1276900 = 2719^2 + 1130^2 .

It is a cyclic number.

It is not a de Polignac number, because 8669861 - 2¹⁰ = 8668837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8669821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4334930 + 4334931.

It is an arithmetic number, because the mean of its divisors is an integer number (4334931).

Almost surely, 2^8669861 is an apocalyptic number.

It is an amenable number.

8669861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8669861 is an equidigital number, since it uses as much as digits as its factorization.

8669861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The square root of 8669861 is about 2944.4627693350. The cubic root of 8669861 is about 205.4332380419.

The spelling of 8669861 in words is "eight million, six hundred sixty-nine thousand, eight hundred sixty-one".