1681133 has 4 divisors (see below), whose sum is σ = 1686300. Its totient is φ = 1675968.

The previous prime is 1681129. The next prime is 1681151. The reversal of 1681133 is 3311861.

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 644809 + 1036324 = 803^2 + 1018^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681133 - 2² = 1681129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1681099 and 1681108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681103) 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, 2060 + ... + 2757.

It is an arithmetic number, because the mean of its divisors is an integer number (421575).

2^1681133 is an apocalyptic number.

It is an amenable number.

1681133 is a deficient number, since it is larger than the sum of its proper divisors (5167).

1681133 is an equidigital number, since it uses as much as digits as its factorization.

1681133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5166.

The product of its digits is 432, while the sum is 23.

The square root of 1681133 is about 1296.5851302556. The cubic root of 1681133 is about 118.9051571117.

Adding to 1681133 its reverse (3311861), we get a palindrome (4992994).

The spelling of 1681133 in words is "one million, six hundred eighty-one thousand, one hundred thirty-three".