1680871393 has 2 divisors, whose sum is σ = 1680871394. Its totient is φ = 1680871392.

The previous prime is 1680871373. The next prime is 1680871403. The reversal of 1680871393 is 3931780861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221712209 + 459159184 = 34953^2 + 21428^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680871393 - 2⁹ = 1680870881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1680871343) 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, 840435696 + 840435697.

It is an arithmetic number, because the mean of its divisors is an integer number (840435697).

Almost surely, 2^1680871393 is an apocalyptic number.

It is an amenable number.

1680871393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680871393 is an equidigital number, since it uses as much as digits as its factorization.

1680871393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 1680871393 is about 40998.4315919524. The cubic root of 1680871393 is about 1188.9898904228.

The spelling of 1680871393 in words is "one billion, six hundred eighty million, eight hundred seventy-one thousand, three hundred ninety-three".