13563003 has 4 divisors (see below), whose sum is σ = 18084008. Its totient is φ = 9042000.

The previous prime is 13563001. The next prime is 13563007. The reversal of 13563003 is 30036531.

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

It is not a de Polignac number, because 13563003 - 2¹ = 13563001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13563001) 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, 2260498 + ... + 2260503.

It is an arithmetic number, because the mean of its divisors is an integer number (4521002).

Almost surely, 2^13563003 is an apocalyptic number.

13563003 is a deficient number, since it is larger than the sum of its proper divisors (4521005).

13563003 is an equidigital number, since it uses as much as digits as its factorization.

13563003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521004.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 13563003 is about 3682.7982567607. The cubic root of 13563003 is about 238.4799942785.

Adding to 13563003 its reverse (30036531), we get a palindrome (43599534).

The spelling of 13563003 in words is "thirteen million, five hundred sixty-three thousand, three".