631448729 has 2 divisors, whose sum is σ = 631448730. Its totient is φ = 631448728.

The previous prime is 631448723. The next prime is 631448777. The reversal of 631448729 is 927844136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 545923225 + 85525504 = 23365^2 + 9248^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631448729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631448729.

It is not a weakly prime, because it can be changed into another prime (631448723) 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, 315724364 + 315724365.

It is an arithmetic number, because the mean of its divisors is an integer number (315724365).

Almost surely, 2^631448729 is an apocalyptic number.

It is an amenable number.

631448729 is a deficient number, since it is larger than the sum of its proper divisors (1).

631448729 is an equidigital number, since it uses as much as digits as its factorization.

631448729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 44.

The square root of 631448729 is about 25128.6435965016. The cubic root of 631448729 is about 857.9184963776.

The spelling of 631448729 in words is "six hundred thirty-one million, four hundred forty-eight thousand, seven hundred twenty-nine".