16503103 has 4 divisors (see below), whose sum is σ = 16550208. Its totient is φ = 16456000.

The previous prime is 16503089. The next prime is 16503119. The reversal of 16503103 is 30130561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30130561 = 19 ⋅1585819.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16503103 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 (16503143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23023 + ... + 23728.

It is an arithmetic number, because the mean of its divisors is an integer number (4137552).

Almost surely, 2^16503103 is an apocalyptic number.

16503103 is a deficient number, since it is larger than the sum of its proper divisors (47105).

16503103 is an equidigital number, since it uses as much as digits as its factorization.

16503103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47104.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 16503103 is about 4062.4011372586. The cubic root of 16503103 is about 254.5981264416.

Adding to 16503103 its reverse (30130561), we get a palindrome (46633664).

It can be divided in two parts, 1650 and 3103, that added together give a triangular number (4753 = T₉₇).

The spelling of 16503103 in words is "sixteen million, five hundred three thousand, one hundred three".