631668143 has 2 divisors, whose sum is σ = 631668144. Its totient is φ = 631668142.

The previous prime is 631668127. The next prime is 631668173. The reversal of 631668143 is 341866136.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631668143 - 2⁴ = 631668127 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 631668097 and 631668106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631668173) 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, 315834071 + 315834072.

It is an arithmetic number, because the mean of its divisors is an integer number (315834072).

Almost surely, 2^631668143 is an apocalyptic number.

631668143 is a deficient number, since it is larger than the sum of its proper divisors (1).

631668143 is an equidigital number, since it uses as much as digits as its factorization.

631668143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 631668143 is about 25133.0090319484. The cubic root of 631668143 is about 858.0178538928.

The spelling of 631668143 in words is "six hundred thirty-one million, six hundred sixty-eight thousand, one hundred forty-three".