1681733 has 4 divisors (see below), whose sum is σ = 1691628. Its totient is φ = 1671840.

The previous prime is 1681723. The next prime is 1681787. The reversal of 1681733 is 3371861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3371861 = 71 ⋅47491.

It can be written as a sum of positive squares in 2 ways, for example, as 717409 + 964324 = 847^2 + 982^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681733 - 2⁴ = 1681717 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 1681696 and 1681705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4688 + ... + 5033.

It is an arithmetic number, because the mean of its divisors is an integer number (422907).

2^1681733 is an apocalyptic number.

It is an amenable number.

1681733 is a deficient number, since it is larger than the sum of its proper divisors (9895).

1681733 is an equidigital number, since it uses as much as digits as its factorization.

1681733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9894.

The product of its digits is 3024, while the sum is 29.

The square root of 1681733 is about 1296.8164866318. The cubic root of 1681733 is about 118.9193012650.

The spelling of 1681733 in words is "one million, six hundred eighty-one thousand, seven hundred thirty-three".