1081985 has 4 divisors (see below), whose sum is σ = 1298388. Its totient is φ = 865584.

The previous prime is 1081981. The next prime is 1082017. The reversal of 1081985 is 5891801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5891801 = 2111 ⋅2791.

It can be written as a sum of positive squares in 2 ways, for example, as 620944 + 461041 = 788^2 + 679^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081985 - 2² = 1081981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1081981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108194 + ... + 108203.

It is an arithmetic number, because the mean of its divisors is an integer number (324597).

2^1081985 is an apocalyptic number.

It is an amenable number.

1081985 is a deficient number, since it is larger than the sum of its proper divisors (216403).

1081985 is an equidigital number, since it uses as much as digits as its factorization.

1081985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216402.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 1081985 is about 1040.1850796853. The cubic root of 1081985 is about 102.6613757791.

The spelling of 1081985 in words is "one million, eighty-one thousand, nine hundred eighty-five".