1680529 has 2 divisors, whose sum is σ = 1680530. Its totient is φ = 1680528.

The previous prime is 1680527. The next prime is 1680551. The reversal of 1680529 is 9250861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1476225 + 204304 = 1215^2 + 452^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680529 - 2¹ = 1680527 is a prime.

Together with 1680527, it forms a pair of twin primes.

1680529 is a lucky number.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 1680529.

It is not a weakly prime, because it can be changed into another prime (1680527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840264 + 840265.

It is an arithmetic number, because the mean of its divisors is an integer number (840265).

2^1680529 is an apocalyptic number.

It is an amenable number.

1680529 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680529 is an equidigital number, since it uses as much as digits as its factorization.

1680529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1680529 is about 1296.3521898003. The cubic root of 1680529 is about 118.8909152645.

It can be divided in two parts, 1680 and 529, that added together give a square (2209 = 47²).

The spelling of 1680529 in words is "one million, six hundred eighty thousand, five hundred twenty-nine".