1680551 has 2 divisors, whose sum is σ = 1680552. Its totient is φ = 1680550.

The previous prime is 1680529. The next prime is 1680557. The reversal of 1680551 is 1550861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1680551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1680551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840275 + 840276.

It is an arithmetic number, because the mean of its divisors is an integer number (840276).

2^1680551 is an apocalyptic number.

1680551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680551 is an equidigital number, since it uses as much as digits as its factorization.

1680551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1680551 is about 1296.3606751209. The cubic root of 1680551 is about 118.8914340672.

The spelling of 1680551 in words is "one million, six hundred eighty thousand, five hundred fifty-one".