12105503 has 4 divisors (see below), whose sum is σ = 12230400. Its totient is φ = 11980608.

The previous prime is 12105491. The next prime is 12105523. The reversal of 12105503 is 30550121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30550121 = 7 ⋅4364303.

It is a cyclic number.

It is not a de Polignac number, because 12105503 - 2¹⁰ = 12104479 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 (12105523) 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, 62303 + ... + 62496.

It is an arithmetic number, because the mean of its divisors is an integer number (3057600).

Almost surely, 2^12105503 is an apocalyptic number.

12105503 is a deficient number, since it is larger than the sum of its proper divisors (124897).

12105503 is an equidigital number, since it uses as much as digits as its factorization.

12105503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124896.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 12105503 is about 3479.2963369049. The cubic root of 12105503 is about 229.6118405655.

Adding to 12105503 its reverse (30550121), we get a palindrome (42655624).

The spelling of 12105503 in words is "twelve million, one hundred five thousand, five hundred three".