13103503 has 4 divisors (see below), whose sum is σ = 14975440. Its totient is φ = 11231568.

The previous prime is 13103443. The next prime is 13103509. The reversal of 13103503 is 30530131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13103503 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13103509) 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, 935958 + ... + 935971.

It is an arithmetic number, because the mean of its divisors is an integer number (3743860).

Almost surely, 2^13103503 is an apocalyptic number.

13103503 is a deficient number, since it is larger than the sum of its proper divisors (1871937).

13103503 is an equidigital number, since it uses as much as digits as its factorization.

13103503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871936.

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

The square root of 13103503 is about 3619.8761028521. The cubic root of 13103503 is about 235.7558460803.

Adding to 13103503 its reverse (30530131), we get a palindrome (43633634).

The spelling of 13103503 in words is "thirteen million, one hundred three thousand, five hundred three".