656000321 has 2 divisors, whose sum is σ = 656000322. Its totient is φ = 656000320.

The previous prime is 656000309. The next prime is 656000333. The reversal of 656000321 is 123000656.

It is a balanced prime because it is at equal distance from previous prime (656000309) and next prime (656000333).

It can be written as a sum of positive squares in only one way, i.e., 509856400 + 146143921 = 22580^2 + 12089^2 .

It is a cyclic number.

It is not a de Polignac number, because 656000321 - 2¹⁰ = 655999297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (656000351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328000160 + 328000161.

It is an arithmetic number, because the mean of its divisors is an integer number (328000161).

Almost surely, 2^656000321 is an apocalyptic number.

It is an amenable number.

656000321 is a deficient number, since it is larger than the sum of its proper divisors (1).

656000321 is an equidigital number, since it uses as much as digits as its factorization.

656000321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 656000321 is about 25612.5032162028. The cubic root of 656000321 is about 868.8964388792.

Adding to 656000321 its reverse (123000656), we get a palindrome (779000977).

The spelling of 656000321 in words is "six hundred fifty-six million, three hundred twenty-one", and thus it is an aban number.