631327009 has 2 divisors, whose sum is σ = 631327010. Its totient is φ = 631327008.

The previous prime is 631327001. The next prime is 631327087. The reversal of 631327009 is 900723136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630160609 + 1166400 = 25103^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 631327009 - 2³ = 631327001 is a prime.

It is not a weakly prime, because it can be changed into another prime (631327001) 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, 315663504 + 315663505.

It is an arithmetic number, because the mean of its divisors is an integer number (315663505).

Almost surely, 2^631327009 is an apocalyptic number.

It is an amenable number.

631327009 is a deficient number, since it is larger than the sum of its proper divisors (1).

631327009 is an equidigital number, since it uses as much as digits as its factorization.

631327009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 631327009 is about 25126.2215424445. The cubic root of 631327009 is about 857.8633678321.

The spelling of 631327009 in words is "six hundred thirty-one million, three hundred twenty-seven thousand, nine".