1981103868 has 72 divisors (see below), whose sum is σ = 5050085040. Its totient is φ = 654819840.

The previous prime is 1981103867. The next prime is 1981103879. The reversal of 1981103868 is 8683011891.

It is a super-2 number, since 2×1981103868² = 7849545071609122848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981103867) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 3374671 + ... + 3375257.

It is an arithmetic number, because the mean of its divisors is an integer number (70140070).

Almost surely, 2^1981103868 is an apocalyptic number.

1981103868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1981103868 is an abundant number, since it is smaller than the sum of its proper divisors (3068981172).

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

1981103868 is a wasteful number, since it uses less digits than its factorization.

1981103868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227 (or 1222 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 1981103868 is about 44509.5929884783. The cubic root of 1981103868 is about 1255.9405483577.

The spelling of 1981103868 in words is "one billion, nine hundred eighty-one million, one hundred three thousand, eight hundred sixty-eight".