13331603 has 4 divisors (see below), whose sum is σ = 13339968. Its totient is φ = 13323240.

The previous prime is 13331573. The next prime is 13331623. The reversal of 13331603 is 30613331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 30613331 = 7 ⋅4373333.

It is a cyclic number.

It is not a de Polignac number, because 13331603 - 2¹⁰ = 13330579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13331623) 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 in 3 ways as a sum of consecutive naturals, for example, 968 + ... + 5253.

It is an arithmetic number, because the mean of its divisors is an integer number (3334992).

Almost surely, 2^13331603 is an apocalyptic number.

13331603 is a deficient number, since it is larger than the sum of its proper divisors (8365).

13331603 is an equidigital number, since it uses as much as digits as its factorization.

13331603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8364.

The product of its (nonzero) digits is 486, while the sum is 20.

The square root of 13331603 is about 3651.2467733639. The cubic root of 13331603 is about 237.1159621705.

Adding to 13331603 its reverse (30613331), we get a palindrome (43944934).

The spelling of 13331603 in words is "thirteen million, three hundred thirty-one thousand, six hundred three".