631388142893 has 2 divisors, whose sum is σ = 631388142894. Its totient is φ = 631388142892.

The previous prime is 631388142839. The next prime is 631388142943. The reversal of 631388142893 is 398241883136.

Together with previous prime (631388142839) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631203237289 + 184905604 = 794483^2 + 13598^2 .

It is a cyclic number.

It is not a de Polignac number, because 631388142893 - 2¹⁰ = 631388141869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631388142193) 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, 315694071446 + 315694071447.

It is an arithmetic number, because the mean of its divisors is an integer number (315694071447).

Almost surely, 2^631388142893 is an apocalyptic number.

It is an amenable number.

631388142893 is a deficient number, since it is larger than the sum of its proper divisors (1).

631388142893 is an equidigital number, since it uses as much as digits as its factorization.

631388142893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5971968, while the sum is 56.

The spelling of 631388142893 in words is "six hundred thirty-one billion, three hundred eighty-eight million, one hundred forty-two thousand, eight hundred ninety-three".