1991301120000 has 1800 divisors, whose sum is σ = 8048275627392. Its totient is φ = 471859200000.

The previous prime is 1991301119999. The next prime is 1991301120037. The reversal of 1991301120000 is 211031991.

It is a tau number, because it is divible by the number of its divisors (1800).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 119 ways as a sum of consecutive naturals, for example, 48568319980 + ... + 48568320020.

Almost surely, 2^{1991301120000} is an apocalyptic number.

1991301120000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1991301120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4024137813696).

1991301120000 is an abundant number, since it is smaller than the sum of its proper divisors (6056974507392).

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

1991301120000 is an equidigital number, since it uses as much as digits as its factorization.

1991301120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

Adding to 1991301120000 its reverse (211031991), we get a palindrome (1991512151991).

The spelling of 1991301120000 in words is "one trillion, nine hundred ninety-one billion, three hundred one million, one hundred twenty thousand".