1991034883312 has 40 divisors (see below), whose sum is σ = 4060821340800. Its totient is φ = 943085068992.

The previous prime is 1991034883307. The next prime is 1991034883333. The reversal of 1991034883312 is 2133884301991.

It is a self number, because there is not a number n which added to its sum of digits gives 1991034883312.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 8696613 + ... + 8922619.

It is an arithmetic number, because the mean of its divisors is an integer number (101520533520).

Almost surely, 2^{1991034883312} is an apocalyptic number.

It is an amenable number.

1991034883312 is an abundant number, since it is smaller than the sum of its proper divisors (2069786457488).

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

1991034883312 is a wasteful number, since it uses less digits than its factorization.

1991034883312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255013 (or 255007 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 1991034883312 in words is "one trillion, nine hundred ninety-one billion, thirty-four million, eight hundred eighty-three thousand, three hundred twelve".