630985321 has 2 divisors, whose sum is σ = 630985322. Its totient is φ = 630985320.

The previous prime is 630985319. The next prime is 630985331. The reversal of 630985321 is 123589036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 478734400 + 152250921 = 21880^2 + 12339^2 .

It is a cyclic number.

It is not a de Polignac number, because 630985321 - 2¹ = 630985319 is a prime.

Together with 630985319, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (630985301) 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, 315492660 + 315492661.

It is an arithmetic number, because the mean of its divisors is an integer number (315492661).

Almost surely, 2^630985321 is an apocalyptic number.

It is an amenable number.

630985321 is a deficient number, since it is larger than the sum of its proper divisors (1).

630985321 is an equidigital number, since it uses as much as digits as its factorization.

630985321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 630985321 is about 25119.4211915800. The cubic root of 630985321 is about 857.7085750905.

The spelling of 630985321 in words is "six hundred thirty million, nine hundred eighty-five thousand, three hundred twenty-one".