1680871 has 2 divisors, whose sum is σ = 1680872. Its totient is φ = 1680870.

The previous prime is 1680859. The next prime is 1680881. The reversal of 1680871 is 1780861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1680871 - 2⁵ = 1680839 is a prime.

1680871 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840435 + 840436.

It is an arithmetic number, because the mean of its divisors is an integer number (840436).

2^1680871 is an apocalyptic number.

1680871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680871 is an equidigital number, since it uses as much as digits as its factorization.

1680871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 1680871 is about 1296.4840916880. The cubic root of 1680871 is about 118.8989797758.

The spelling of 1680871 in words is "one million, six hundred eighty thousand, eight hundred seventy-one".