631388881375 has 24 divisors (see below), whose sum is σ = 916622038800. Its totient is φ = 432952371600.

The previous prime is 631388881373. The next prime is 631388881391. The reversal of 631388881375 is 573188883136.

631388881375 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 631388881375 - 2¹ = 631388881373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631388881373) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51535825 + ... + 51548074.

It is an arithmetic number, because the mean of its divisors is an integer number (38192584950).

Almost surely, 2^631388881375 is an apocalyptic number.

631388881375 is a deficient number, since it is larger than the sum of its proper divisors (285233157425).

631388881375 is a wasteful number, since it uses less digits than its factorization.

631388881375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103083928 (or 103083911 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 61.

The spelling of 631388881375 in words is "six hundred thirty-one billion, three hundred eighty-eight million, eight hundred eighty-one thousand, three hundred seventy-five".