1081689 has 16 divisors (see below), whose sum is σ = 1735680. Its totient is φ = 585360.

The previous prime is 1081687. The next prime is 1081699. The reversal of 1081689 is 9861801.

It is not a de Polignac number, because 1081689 - 2¹ = 1081687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1081681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 957 + ... + 1754.

It is an arithmetic number, because the mean of its divisors is an integer number (108480).

2^1081689 is an apocalyptic number.

1081689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1081689 is a deficient number, since it is larger than the sum of its proper divisors (653991).

1081689 is a wasteful number, since it uses less digits than its factorization.

1081689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1081689 is about 1040.0427875814. The cubic root of 1081689 is about 102.6520131913.

It can be divided in two parts, 1081 and 689, that added together give a triangular number (1770 = T₅₉).

The spelling of 1081689 in words is "one million, eighty-one thousand, six hundred eighty-nine".