1089181 has 4 divisors (see below), whose sum is σ = 1093500. Its totient is φ = 1084864.

The previous prime is 1089161. The next prime is 1089191. The reversal of 1089181 is 1819801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 156025 + 933156 = 395^2 + 966^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089181 - 2⁹ = 1088669 is a prime.

It is a super-2 number, since 2×1089181² = 2372630501522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1756 + ... + 2293.

It is an arithmetic number, because the mean of its divisors is an integer number (273375).

2^1089181 is an apocalyptic number.

It is an amenable number.

1089181 is a deficient number, since it is larger than the sum of its proper divisors (4319).

1089181 is an equidigital number, since it uses as much as digits as its factorization.

1089181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1089181 is about 1043.6383473215. The cubic root of 1089181 is about 102.8884644287. Note that the first 3 decimals are identical.

The spelling of 1089181 in words is "one million, eighty-nine thousand, one hundred eighty-one".