8491589 has 2 divisors, whose sum is σ = 8491590. Its totient is φ = 8491588.

The previous prime is 8491583. The next prime is 8491591. The reversal of 8491589 is 9851948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4622500 + 3869089 = 2150^2 + 1967^2 .

It is a cyclic number.

It is not a de Polignac number, because 8491589 - 2⁸ = 8491333 is a prime.

Together with 8491591, 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 (8491583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4245794 + 4245795.

It is an arithmetic number, because the mean of its divisors is an integer number (4245795).

Almost surely, 2^8491589 is an apocalyptic number.

It is an amenable number.

8491589 is a deficient number, since it is larger than the sum of its proper divisors (1).

8491589 is an equidigital number, since it uses as much as digits as its factorization.

8491589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 44.

The square root of 8491589 is about 2914.0331158036. The cubic root of 8491589 is about 204.0154175840.

The spelling of 8491589 in words is "eight million, four hundred ninety-one thousand, five hundred eighty-nine".