13013503 has 4 divisors (see below), whose sum is σ = 13063248. Its totient is φ = 12963760.

The previous prime is 13013467. The next prime is 13013509. The reversal of 13013503 is 30531031.

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

It is a cyclic number.

It is not a de Polignac number, because 13013503 - 2¹⁷ = 12882431 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 (13013509) 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, 24478 + ... + 25003.

It is an arithmetic number, because the mean of its divisors is an integer number (3265812).

Almost surely, 2^13013503 is an apocalyptic number.

13013503 is a deficient number, since it is larger than the sum of its proper divisors (49745).

13013503 is an equidigital number, since it uses as much as digits as its factorization.

13013503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49744.

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

The square root of 13013503 is about 3607.4233186583. The cubic root of 13013503 is about 235.2148510433.

Adding to 13013503 its reverse (30531031), we get a palindrome (43544534).

The spelling of 13013503 in words is "thirteen million, thirteen thousand, five hundred three".