631881581532 has 24 divisors (see below), whose sum is σ = 1561119201936. Its totient is φ = 198237358848.

The previous prime is 631881581519. The next prime is 631881581557. The reversal of 631881581532 is 235185188136.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1548729163 + ... + 1548729570.

It is an arithmetic number, because the mean of its divisors is an integer number (65046633414).

Almost surely, 2^631881581532 is an apocalyptic number.

It is an amenable number.

631881581532 is an abundant number, since it is smaller than the sum of its proper divisors (929237620404).

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

631881581532 is a wasteful number, since it uses less digits than its factorization.

631881581532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097458757 (or 3097458755 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 51.

The spelling of 631881581532 in words is "six hundred thirty-one billion, eight hundred eighty-one million, five hundred eighty-one thousand, five hundred thirty-two".