1811489 has 2 divisors, whose sum is σ = 1811490. Its totient is φ = 1811488.

The previous prime is 1811473. The next prime is 1811507. The reversal of 1811489 is 9841181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1420864 + 390625 = 1192^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 1811489 - 2⁴ = 1811473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1811389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905744 + 905745.

It is an arithmetic number, because the mean of its divisors is an integer number (905745).

2^1811489 is an apocalyptic number.

It is an amenable number.

1811489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811489 is an equidigital number, since it uses as much as digits as its factorization.

1811489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 32.

The square root of 1811489 is about 1345.9156734357. The cubic root of 1811489 is about 121.9023001740.

The spelling of 1811489 in words is "one million, eight hundred eleven thousand, four hundred eighty-nine".