1311003 has 12 divisors (see below), whose sum is σ = 1959360. Its totient is φ = 843696.

The previous prime is 1311001. The next prime is 1311029. The reversal of 1311003 is 3001131.

It is not a de Polignac number, because 1311003 - 2¹ = 1311001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2251 + ... + 2772.

It is an arithmetic number, because the mean of its divisors is an integer number (163280).

2^1311003 is an apocalyptic number.

1311003 is a deficient number, since it is larger than the sum of its proper divisors (648357).

1311003 is a wasteful number, since it uses less digits than its factorization.

1311003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5058 (or 5055 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 9.

The square root of 1311003 is about 1144.9903929728. The cubic root of 1311003 is about 109.4463363746.

Adding to 1311003 its reverse (3001131), we get a palindrome (4312134).

The spelling of 1311003 in words is "one million, three hundred eleven thousand, three".