1681073 has 2 divisors, whose sum is σ = 1681074. Its totient is φ = 1681072.

The previous prime is 1681061. The next prime is 1681091. The reversal of 1681073 is 3701861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1567504 + 113569 = 1252^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681073 - 2²⁰ = 632497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1681003) 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, 840536 + 840537.

It is an arithmetic number, because the mean of its divisors is an integer number (840537).

2^1681073 is an apocalyptic number.

It is an amenable number.

1681073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681073 is an equidigital number, since it uses as much as digits as its factorization.

1681073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1681073 is about 1296.5619923475. The cubic root of 1681073 is about 118.9037425113.

The spelling of 1681073 in words is "one million, six hundred eighty-one thousand, seventy-three".