931891220442 has 384 divisors, whose sum is σ = 2634721689600. Its totient is φ = 240337933056.

The previous prime is 931891220423. The next prime is 931891220459. The reversal of 931891220442 is 244022198139.

931891220442 is a `hidden beast` number, since 9 + 3 + 1 + 89 + 122 + 0 + 442 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 380828863 + ... + 380831309.

It is an arithmetic number, because the mean of its divisors is an integer number (6861254400).

Almost surely, 2^931891220442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 931891220442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317360844800).

931891220442 is an abundant number, since it is smaller than the sum of its proper divisors (1702830469158).

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

931891220442 is a wasteful number, since it uses less digits than its factorization.

931891220442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2672 (or 2660 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 931891220442 in words is "nine hundred thirty-one billion, eight hundred ninety-one million, two hundred twenty thousand, four hundred forty-two".