1080991 has 4 divisors (see below), whose sum is σ = 1087632. Its totient is φ = 1074352.

The previous prime is 1080983. The next prime is 1081027. The reversal of 1080991 is 1990801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1990801 = 19 ⋅104779.

It is a cyclic number.

It is not a de Polignac number, because 1080991 - 2³ = 1080983 is a prime.

It is a Duffinian number.

1080991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1080901) 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, 3070 + ... + 3403.

It is an arithmetic number, because the mean of its divisors is an integer number (271908).

2^1080991 is an apocalyptic number.

1080991 is a deficient number, since it is larger than the sum of its proper divisors (6641).

1080991 is an equidigital number, since it uses as much as digits as its factorization.

1080991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6640.

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

The square root of 1080991 is about 1039.7071703129. The cubic root of 1080991 is about 102.6299284323.

The spelling of 1080991 in words is "one million, eighty thousand, nine hundred ninety-one".