8489861 has 2 divisors, whose sum is σ = 8489862. Its totient is φ = 8489860.

The previous prime is 8489857. The next prime is 8489863. The reversal of 8489861 is 1689848.

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., 7873636 + 616225 = 2806^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 8489861 - 2² = 8489857 is a prime.

Together with 8489863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8489863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4244930 + 4244931.

It is an arithmetic number, because the mean of its divisors is an integer number (4244931).

Almost surely, 2^8489861 is an apocalyptic number.

It is an amenable number.

8489861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8489861 is an equidigital number, since it uses as much as digits as its factorization.

8489861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 44.

The square root of 8489861 is about 2913.7366044308. The cubic root of 8489861 is about 204.0015779065.

The spelling of 8489861 in words is "eight million, four hundred eighty-nine thousand, eight hundred sixty-one".