645000589 has 2 divisors, whose sum is σ = 645000590. Its totient is φ = 645000588.

The previous prime is 645000557. The next prime is 645000607. The reversal of 645000589 is 985000546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 632924964 + 12075625 = 25158^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 645000589 - 2⁵ = 645000557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645000509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322500294 + 322500295.

It is an arithmetic number, because the mean of its divisors is an integer number (322500295).

Almost surely, 2^645000589 is an apocalyptic number.

It is an amenable number.

645000589 is a deficient number, since it is larger than the sum of its proper divisors (1).

645000589 is an equidigital number, since it uses as much as digits as its factorization.

645000589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 645000589 is about 25396.8617943241. The cubic root of 645000589 is about 864.0125227702.

The spelling of 645000589 in words is "six hundred forty-five million, five hundred eighty-nine", and thus it is an aban number.