631632889 has 2 divisors, whose sum is σ = 631632890. Its totient is φ = 631632888.

The previous prime is 631632817. The next prime is 631632899. The reversal of 631632889 is 988236136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562875625 + 68757264 = 23725^2 + 8292^2 .

It is a cyclic number.

It is not a de Polignac number, because 631632889 - 2¹¹ = 631630841 is a prime.

It is not a weakly prime, because it can be changed into another prime (631632899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315816444 + 315816445.

It is an arithmetic number, because the mean of its divisors is an integer number (315816445).

Almost surely, 2^631632889 is an apocalyptic number.

It is an amenable number.

631632889 is a deficient number, since it is larger than the sum of its proper divisors (1).

631632889 is an equidigital number, since it uses as much as digits as its factorization.

631632889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 46.

The square root of 631632889 is about 25132.3076735902. The cubic root of 631632889 is about 858.0018913316.

The spelling of 631632889 in words is "six hundred thirty-one million, six hundred thirty-two thousand, eight hundred eighty-nine".