631322641 has 2 divisors, whose sum is σ = 631322642. Its totient is φ = 631322640.

The previous prime is 631322623. The next prime is 631322647. The reversal of 631322641 is 146223136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 576192016 + 55130625 = 24004^2 + 7425^2 .

It is a cyclic number.

It is not a de Polignac number, because 631322641 - 2⁹ = 631322129 is a prime.

It is not a weakly prime, because it can be changed into another prime (631322647) 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, 315661320 + 315661321.

It is an arithmetic number, because the mean of its divisors is an integer number (315661321).

Almost surely, 2^631322641 is an apocalyptic number.

It is an amenable number.

631322641 is a deficient number, since it is larger than the sum of its proper divisors (1).

631322641 is an equidigital number, since it uses as much as digits as its factorization.

631322641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 28.

The square root of 631322641 is about 25126.1346211470. The cubic root of 631322641 is about 857.8613893773.

Adding to 631322641 its reverse (146223136), we get a palindrome (777545777).

The spelling of 631322641 in words is "six hundred thirty-one million, three hundred twenty-two thousand, six hundred forty-one".