1091081 has 4 divisors (see below), whose sum is σ = 1096464. Its totient is φ = 1085700.

The previous prime is 1091071. The next prime is 1091119. The reversal of 1091081 is 1801901.

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.

It is a cyclic number.

It is not a de Polignac number, because 1091081 - 2⁶ = 1091017 is a prime.

It is a super-2 number, since 2×1091081² = 2380915497122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091021) 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, 2375 + ... + 2796.

It is an arithmetic number, because the mean of its divisors is an integer number (274116).

2^1091081 is an apocalyptic number.

It is an amenable number.

1091081 is a deficient number, since it is larger than the sum of its proper divisors (5383).

1091081 is an equidigital number, since it uses as much as digits as its factorization.

1091081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1091081 is about 1044.5482277042. The cubic root of 1091081 is about 102.9482569151.

Adding to 1091081 its reverse (1801901), we get a palindrome (2892982).

The spelling of 1091081 in words is "one million, ninety-one thousand, eighty-one".