1681943044 has 12 divisors (see below), whose sum is σ = 3044897100. Its totient is φ = 811972448.

The previous prime is 1681943033. The next prime is 1681943051. The reversal of 1681943044 is 4403491861.

It can be written as a sum of positive squares in 2 ways, for example, as 993510400 + 688432644 = 31520^2 + 26238^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1681942988 and 1681943006.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7249639 + ... + 7249870.

It is an arithmetic number, because the mean of its divisors is an integer number (253741425).

Almost surely, 2^1681943044 is an apocalyptic number.

It is an amenable number.

1681943044 is a deficient number, since it is larger than the sum of its proper divisors (1362954056).

1681943044 is a wasteful number, since it uses less digits than its factorization.

1681943044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14499542 (or 14499540 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 1681943044 is about 41011.4989240823. The cubic root of 1681943044 is about 1189.2425196084.

The spelling of 1681943044 in words is "one billion, six hundred eighty-one million, nine hundred forty-three thousand, forty-four".