630509921 has 2 divisors, whose sum is σ = 630509922. Its totient is φ = 630509920.

The previous prime is 630509897. The next prime is 630509941. The reversal of 630509921 is 129905036.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362369296 + 268140625 = 19036^2 + 16375^2 .

It is a cyclic number.

It is not a de Polignac number, because 630509921 - 2⁶ = 630509857 is a prime.

It is not a weakly prime, because it can be changed into another prime (630509941) 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, 315254960 + 315254961.

It is an arithmetic number, because the mean of its divisors is an integer number (315254961).

Almost surely, 2^630509921 is an apocalyptic number.

It is an amenable number.

630509921 is a deficient number, since it is larger than the sum of its proper divisors (1).

630509921 is an equidigital number, since it uses as much as digits as its factorization.

630509921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 630509921 is about 25109.9566108745. The cubic root of 630509921 is about 857.4931146617.

The spelling of 630509921 in words is "six hundred thirty million, five hundred nine thousand, nine hundred twenty-one".