1681085843 has 2 divisors, whose sum is σ = 1681085844. Its totient is φ = 1681085842.

The previous prime is 1681085831. The next prime is 1681085867. The reversal of 1681085843 is 3485801861.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1681085843 - 2¹² = 1681081747 is a prime.

It is a super-2 number, since 2×1681085843² = 5652099223070041298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1681085794 and 1681085803.

It is not a weakly prime, because it can be changed into another prime (1681085873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840542921 + 840542922.

It is an arithmetic number, because the mean of its divisors is an integer number (840542922).

Almost surely, 2^1681085843 is an apocalyptic number.

1681085843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681085843 is an equidigital number, since it uses as much as digits as its factorization.

1681085843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 1681085843 is about 41001.0468524890. The cubic root of 1681085843 is about 1189.0404530933.

The spelling of 1681085843 in words is "one billion, six hundred eighty-one million, eighty-five thousand, eight hundred forty-three".