1100989 has 4 divisors (see below), whose sum is σ = 1119100. Its totient is φ = 1082880.

The previous prime is 1100977. The next prime is 1101071. The reversal of 1100989 is 9890011.

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 444889 + 656100 = 667^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100989 - 2¹⁹ = 576701 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 (1100909) 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, 8964 + ... + 9085.

It is an arithmetic number, because the mean of its divisors is an integer number (279775).

2^1100989 is an apocalyptic number.

It is an amenable number.

1100989 is a deficient number, since it is larger than the sum of its proper divisors (18111).

1100989 is an equidigital number, since it uses as much as digits as its factorization.

1100989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18110.

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

The square root of 1100989 is about 1049.2802294907. The cubic root of 1100989 is about 103.2589394008.

The spelling of 1100989 in words is "one million, one hundred thousand, nine hundred eighty-nine".