111645 has 16 divisors (see below), whose sum is σ = 198720. Its totient is φ = 59472.

The previous prime is 111641. The next prime is 111653. The reversal of 111645 is 546111.

It is not a de Polignac number, because 111645 - 2² = 111641 is a prime.

It is a Curzon number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279 + ... + 548.

It is an arithmetic number, because the mean of its divisors is an integer number (12420).

2¹¹¹⁶⁴⁵ is an apocalyptic number.

111645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

111645 is a deficient number, since it is larger than the sum of its proper divisors (87075).

111645 is an equidigital number, since it uses as much as digits as its factorization.

111645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841 (or 835 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 111645 is about 334.1332069699. The cubic root of 111645 is about 48.1518627786.

Adding to 111645 its reverse (546111), we get a palindrome (657756).

The spelling of 111645 in words is "one hundred eleven thousand, six hundred forty-five".