631938195906 has 8 divisors (see below), whose sum is σ = 1263876391824. Its totient is φ = 210646065300.

The previous prime is 631938195899. The next prime is 631938195907. The reversal of 631938195906 is 609591839136.

It is a sphenic number, since it is the product of 3 distinct primes.

631938195906 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 631938195906.

It is not an unprimeable number, because it can be changed into a prime (631938195907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52661516320 + ... + 52661516331.

It is an arithmetic number, because the mean of its divisors is an integer number (157984548978).

Almost surely, 2^631938195906 is an apocalyptic number.

631938195906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631938195906 is a wasteful number, since it uses less digits than its factorization.

631938195906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105323032656.

The product of its (nonzero) digits is 9447840, while the sum is 60.

The spelling of 631938195906 in words is "six hundred thirty-one billion, nine hundred thirty-eight million, one hundred ninety-five thousand, nine hundred six".