630007321 has 2 divisors, whose sum is σ = 630007322. Its totient is φ = 630007320.

The previous prime is 630007309. The next prime is 630007349. The reversal of 630007321 is 123700036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 566963721 + 63043600 = 23811^2 + 7940^2 .

It is a cyclic number.

It is not a de Polignac number, because 630007321 - 2⁷ = 630007193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 630007292 and 630007301.

It is not a weakly prime, because it can be changed into another prime (630007361) 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, 315003660 + 315003661.

It is an arithmetic number, because the mean of its divisors is an integer number (315003661).

Almost surely, 2^630007321 is an apocalyptic number.

It is an amenable number.

630007321 is a deficient number, since it is larger than the sum of its proper divisors (1).

630007321 is an equidigital number, since it uses as much as digits as its factorization.

630007321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 630007321 is about 25099.9466334094. The cubic root of 630007321 is about 857.2652088610.

Adding to 630007321 its reverse (123700036), we get a palindrome (753707357).

The spelling of 630007321 in words is "six hundred thirty million, seven thousand, three hundred twenty-one".