9999503 has 4 divisors (see below), whose sum is σ = 10434288. Its totient is φ = 9564720.

The previous prime is 9999481. The next prime is 9999511. The reversal of 9999503 is 3059999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3059999 = 163 ⋅18773.

It is a cyclic number.

It is not a de Polignac number, because 9999503 - 2¹⁰ = 9998479 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 (9999533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217358 + ... + 217403.

It is an arithmetic number, because the mean of its divisors is an integer number (2608572).

Almost surely, 2^9999503 is an apocalyptic number.

9999503 is a deficient number, since it is larger than the sum of its proper divisors (434785).

9999503 is a wasteful number, since it uses less digits than its factorization.

9999503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434784.

The product of its (nonzero) digits is 98415, while the sum is 44.

The square root of 9999503 is about 3162.1990765921. The cubic root of 9999503 is about 215.4398997639.

The spelling of 9999503 in words is "nine million, nine hundred ninety-nine thousand, five hundred three".