8564321 has 2 divisors, whose sum is σ = 8564322.
Its totient is φ = 8564320.
The previous prime is 8564317. The next prime is 8564329. The reversal of 8564321 is 1234658.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 7980625 + 583696 = 2825^2 + 764^2
It is a cyclic number.
It is not a de Polignac number, because 8564321 - 22 = 8564317 is a prime.
It is a Chen prime.
It is equal to p575183 and since 8564321 and 575183 have the same sum of digits, it is a Honaker prime.
It is not a weakly prime, because it can be changed into another prime (8564329) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4282160 + 4282161.
It is an arithmetic number, because the mean of its divisors is an integer number (4282161).
Almost surely, 28564321 is an apocalyptic number.
It is an amenable number.
8564321 is a deficient number, since it is larger than the sum of its proper divisors (1).
8564321 is an equidigital number, since it uses as much as digits as its factorization.
8564321 is an evil number, because the sum of its binary digits is even.
The product of its digits is 5760, while the sum is 29.
The square root of 8564321 is about 2926.4861181970.
The cubic root of 8564321 is about 204.5962387992.
Adding to 8564321 its reverse (1234658), we get a palindrome (9798979).
The spelling of 8564321 in words is "eight million, five hundred sixty-four thousand, three hundred twenty-one".