1001089 has 2 divisors, whose sum is σ = 1001090. Its totient is φ = 1001088.

The previous prime is 1001087. The next prime is 1001093. The reversal of 1001089 is 9801001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 1089 = 1000^2 + 33^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001089 - 2¹ = 1001087 is a prime.

Together with 1001087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1001081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500544 + 500545.

It is an arithmetic number, because the mean of its divisors is an integer number (500545).

2^1001089 is an apocalyptic number.

It is an amenable number.

1001089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001089 is an equidigital number, since it uses as much as digits as its factorization.

1001089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1001089 is about 1000.5443518405. The cubic root of 1001089 is about 100.0362868311.

It can be divided in two parts, 100 and 1089, that multiplied together give a square (108900 = 330²).

The spelling of 1001089 in words is "one million, one thousand, eighty-nine".