2181931682 has 24 divisors (see below), whose sum is σ = 3809128284. Its totient is φ = 934651872.

The previous prime is 2181931679. The next prime is 2181931721. The reversal of 2181931682 is 2861391812.

It can be written as a sum of positive squares in 2 ways, for example, as 2181917521 + 14161 = 46711^2 + 119^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258188 + ... + 266504.

Almost surely, 2^2181931682 is an apocalyptic number.

2181931682 is a deficient number, since it is larger than the sum of its proper divisors (1627196602).

2181931682 is a wasteful number, since it uses less digits than its factorization.

2181931682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010 (or 11003 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 2181931682 is about 46711.1515807521. The cubic root of 2181931682 is about 1297.0211244587.

The spelling of 2181931682 in words is "two billion, one hundred eighty-one million, nine hundred thirty-one thousand, six hundred eighty-two".