1981981982 has 16 divisors (see below), whose sum is σ = 2982787200. Its totient is φ = 987726168.

The previous prime is 1981981961. The next prime is 1981981999. The reversal of 1981981982 is 2891891891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1133633 + ... + 1135379.

It is an arithmetic number, because the mean of its divisors is an integer number (186424200).

Almost surely, 2^1981981982 is an apocalyptic number.

1981981982 is a deficient number, since it is larger than the sum of its proper divisors (1000805218).

1981981982 is a wasteful number, since it uses less digits than its factorization.

1981981982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3295.

The product of its digits is 746496, while the sum is 56.

The square root of 1981981982 is about 44519.4562186018. The cubic root of 1981981982 is about 1256.1260839895.

Subtracting 1981981982 from its reverse (2891891891), we obtain a palindrome (909909909).

The spelling of 1981981982 in words is "one billion, nine hundred eighty-one million, nine hundred eighty-one thousand, nine hundred eighty-two".