1981118180484 has 27 divisors (see below), whose sum is σ = 5007847859287. Its totient is φ = 660369911784.

The previous prime is 1981118180417. The next prime is 1981118180501. The reversal of 1981118180484 is 4840818111891.

The square root of 1981118180484 is 1407522.

It is a perfect power (a square), and thus also a powerful number.

1981118180484 is a `hidden beast` number, since 1 + 9 + 8 + 1 + 1 + 1 + 81 + 80 + 484 = 666.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1981118180484.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8327839 + ... + 8562425.

Almost surely, 2^{1981118180484} is an apocalyptic number.

1981118180484 is the 1407522-nd square number.

It is an amenable number.

1981118180484 is an abundant number, since it is smaller than the sum of its proper divisors (3026729678803).

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

1981118180484 is an frugal number, since it uses more digits than its factorization.

1981118180484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469184 (or 234592 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 54.

The spelling of 1981118180484 in words is "one trillion, nine hundred eighty-one billion, one hundred eighteen million, one hundred eighty thousand, four hundred eighty-four".