1680505439 has 2 divisors, whose sum is σ = 1680505440. Its totient is φ = 1680505438.

The previous prime is 1680505433. The next prime is 1680505441. The reversal of 1680505439 is 9345050861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1680505439 - 2⁴ = 1680505423 is a prime.

Together with 1680505441, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1680505396 and 1680505405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680505433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840252719 + 840252720.

It is an arithmetic number, because the mean of its divisors is an integer number (840252720).

Almost surely, 2^1680505439 is an apocalyptic number.

1680505439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680505439 is an equidigital number, since it uses as much as digits as its factorization.

1680505439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 1680505439 is about 40993.9683246206. The cubic root of 1680505439 is about 1188.9035964547.

The spelling of 1680505439 in words is "one billion, six hundred eighty million, five hundred five thousand, four hundred thirty-nine".