1812089 has 2 divisors, whose sum is σ = 1812090. Its totient is φ = 1812088.

The previous prime is 1812073. The next prime is 1812091. The reversal of 1812089 is 9802181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1345600 + 466489 = 1160^2 + 683^2 .

It is an emirp because it is prime and its reverse (9802181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1812089 - 2⁴ = 1812073 is a prime.

Together with 1812091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1812059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906044 + 906045.

It is an arithmetic number, because the mean of its divisors is an integer number (906045).

2^1812089 is an apocalyptic number.

It is an amenable number.

1812089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812089 is an equidigital number, since it uses as much as digits as its factorization.

1812089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1812089 is about 1346.1385515615. The cubic root of 1812089 is about 121.9157574838.

The spelling of 1812089 in words is "one million, eight hundred twelve thousand, eighty-nine".