680030321 has 2 divisors, whose sum is σ = 680030322. Its totient is φ = 680030320.

The previous prime is 680030297. The next prime is 680030359. The reversal of 680030321 is 123030086.

680030321 = 18439² + 18440².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340033600 + 339996721 = 18440^2 + 18439^2 .

It is a cyclic number.

It is not a de Polignac number, because 680030321 - 2²² = 675836017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (680030521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340015160 + 340015161.

It is an arithmetic number, because the mean of its divisors is an integer number (340015161).

Almost surely, 2^680030321 is an apocalyptic number.

680030321 is the 18440-th centered square number.

It is an amenable number.

680030321 is a deficient number, since it is larger than the sum of its proper divisors (1).

680030321 is an equidigital number, since it uses as much as digits as its factorization.

680030321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 680030321 is about 26077.3909929655. The cubic root of 680030321 is about 879.3790044602.

The spelling of 680030321 in words is "six hundred eighty million, thirty thousand, three hundred twenty-one".