1681333 has 4 divisors (see below), whose sum is σ = 1739340. Its totient is φ = 1623328.

The previous prime is 1681321. The next prime is 1681349. The reversal of 1681333 is 3331861.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 677329 + 1004004 = 823^2 + 1002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681333 - 2⁹ = 1680821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1681298 and 1681307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681363) 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 in 3 ways as a sum of consecutive naturals, for example, 28960 + ... + 29017.

It is an arithmetic number, because the mean of its divisors is an integer number (434835).

2^1681333 is an apocalyptic number.

It is an amenable number.

1681333 is a deficient number, since it is larger than the sum of its proper divisors (58007).

1681333 is an equidigital number, since it uses as much as digits as its factorization.

1681333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58006.

The product of its digits is 1296, while the sum is 25.

The square root of 1681333 is about 1296.6622536343. The cubic root of 1681333 is about 118.9098722033.

The spelling of 1681333 in words is "one million, six hundred eighty-one thousand, three hundred thirty-three".