1813003 has 2 divisors, whose sum is σ = 1813004. Its totient is φ = 1813002.

The previous prime is 1813001. The next prime is 1813039. The reversal of 1813003 is 3003181.

It is a weak prime.

It is an emirp because it is prime and its reverse (3003181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1813003 - 2¹ = 1813001 is a prime.

Together with 1813001, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1813001) 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 as a sum of consecutive naturals, namely, 906501 + 906502.

It is an arithmetic number, because the mean of its divisors is an integer number (906502).

2^1813003 is an apocalyptic number.

1813003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813003 is an equidigital number, since it uses as much as digits as its factorization.

1813003 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 16.

The square root of 1813003 is about 1346.4779983349. The cubic root of 1813003 is about 121.9362517445.

Adding to 1813003 its reverse (3003181), we get a palindrome (4816184).

The spelling of 1813003 in words is "one million, eight hundred thirteen thousand, three".