8564789 has 2 divisors, whose sum is σ = 8564790. Its totient is φ = 8564788.

The previous prime is 8564767. The next prime is 8564791. The reversal of 8564789 is 9874658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6848689 + 1716100 = 2617^2 + 1310^2 .

It is a cyclic number.

It is not a de Polignac number, because 8564789 - 2¹² = 8560693 is a prime.

It is a super-2 number, since 2×8564789² = 146711221229042, which contains 22 as substring.

Together with 8564791, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8564729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4282394 + 4282395.

It is an arithmetic number, because the mean of its divisors is an integer number (4282395).

Almost surely, 2^8564789 is an apocalyptic number.

It is an amenable number.

8564789 is a deficient number, since it is larger than the sum of its proper divisors (1).

8564789 is an equidigital number, since it uses as much as digits as its factorization.

8564789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 47.

The square root of 8564789 is about 2926.5660764794. The cubic root of 8564789 is about 204.5999654732.

The spelling of 8564789 in words is "eight million, five hundred sixty-four thousand, seven hundred eighty-nine".