31291905882 has 32 divisors (see below), whose sum is σ = 68056172352. Its totient is φ = 9551741184.

The previous prime is 31291905851. The next prime is 31291905947. The reversal of 31291905882 is 28850919213.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4141948 + ... + 4149495.

It is an arithmetic number, because the mean of its divisors is an integer number (2126755386).

Almost surely, 2^31291905882 is an apocalyptic number.

31291905882 is an abundant number, since it is smaller than the sum of its proper divisors (36764266470).

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

31291905882 is a wasteful number, since it uses less digits than its factorization.

31291905882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8291502.

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 31291905882 in words is "thirty-one billion, two hundred ninety-one million, nine hundred five thousand, eight hundred eighty-two".