1081909 has 4 divisors (see below), whose sum is σ = 1086016. Its totient is φ = 1077804.

The previous prime is 1081907. The next prime is 1081919. The reversal of 1081909 is 9091801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9091801 = 449 ⋅20249.

It is a cyclic number.

It is not a de Polignac number, because 1081909 - 2¹ = 1081907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081901) 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 3 ways as a sum of consecutive naturals, for example, 1629 + ... + 2194.

It is an arithmetic number, because the mean of its divisors is an integer number (271504).

2^1081909 is an apocalyptic number.

It is an amenable number.

1081909 is a deficient number, since it is larger than the sum of its proper divisors (4107).

1081909 is an equidigital number, since it uses as much as digits as its factorization.

1081909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4106.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1081909 is about 1040.1485470835. The cubic root of 1081909 is about 102.6589720344.

It can be divided in two parts, 108190 and 9, that multiplied together give a triangular number (973710 = T₁₃₉₅).

The spelling of 1081909 in words is "one million, eighty-one thousand, nine hundred nine".