1331503 has 4 divisors (see below), whose sum is σ = 1341360. Its totient is φ = 1321648.

The previous prime is 1331497. The next prime is 1331513. The reversal of 1331503 is 3051331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3051331 = 739 ⋅4129.

It is a cyclic number.

It is not a de Polignac number, because 1331503 - 2⁵ = 1331471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4723 + ... + 4996.

It is an arithmetic number, because the mean of its divisors is an integer number (335340).

2^1331503 is an apocalyptic number.

1331503 is a deficient number, since it is larger than the sum of its proper divisors (9857).

1331503 is an equidigital number, since it uses as much as digits as its factorization.

1331503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9856.

The product of its (nonzero) digits is 135, while the sum is 16.

The square root of 1331503 is about 1153.9077086145. The cubic root of 1331503 is about 110.0138550041.

Adding to 1331503 its reverse (3051331), we get a palindrome (4382834).

The spelling of 1331503 in words is "one million, three hundred thirty-one thousand, five hundred three".