1681135 has 4 divisors (see below), whose sum is σ = 2017368. Its totient is φ = 1344904.

The previous prime is 1681129. The next prime is 1681151. The reversal of 1681135 is 5311861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5311861 = 1069 ⋅4969.

It is a cyclic number.

It is not a de Polignac number, because 1681135 - 2⁵ = 1681103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168109 + ... + 168118.

It is an arithmetic number, because the mean of its divisors is an integer number (504342).

2^1681135 is an apocalyptic number.

1681135 is a deficient number, since it is larger than the sum of its proper divisors (336233).

1681135 is an equidigital number, since it uses as much as digits as its factorization.

1681135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336232.

The product of its digits is 720, while the sum is 25.

The square root of 1681135 is about 1296.5859015121. The cubic root of 1681135 is about 118.9052042645.

Adding to 1681135 its reverse (5311861), we get a palindrome (6992996).

The spelling of 1681135 in words is "one million, six hundred eighty-one thousand, one hundred thirty-five".