111603 has 4 divisors (see below), whose sum is σ = 148808. Its totient is φ = 74400.

The previous prime is 111599. The next prime is 111611. The reversal of 111603 is 306111.

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

It is not a de Polignac number, because 111603 - 2² = 111599 is a prime.

It is a D-number.

It is a Duffinian number.

111603 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 111603.

It is not an unprimeable number, because it can be changed into a prime (111623) 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, 18598 + ... + 18603.

It is an arithmetic number, because the mean of its divisors is an integer number (37202).

2¹¹¹⁶⁰³ is an apocalyptic number.

111603 is a deficient number, since it is larger than the sum of its proper divisors (37205).

111603 is an equidigital number, since it uses as much as digits as its factorization.

111603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37204.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 111603 is about 334.0703518722. The cubic root of 111603 is about 48.1458238998.

Adding to 111603 its reverse (306111), we get a palindrome (417714).

The spelling of 111603 in words is "one hundred eleven thousand, six hundred three".