111643 has 8 divisors (see below), whose sum is σ = 131040. Its totient is φ = 93120.

The previous prime is 111641. The next prime is 111653. The reversal of 111643 is 346111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111643 - 2¹ = 111641 is a prime.

111643 is a lucky number.

It is a nialpdrome in base 7.

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 7 ways as a sum of consecutive naturals, for example, 93 + ... + 481.

It is an arithmetic number, because the mean of its divisors is an integer number (16380).

2¹¹¹⁶⁴³ is an apocalyptic number.

111643 is a deficient number, since it is larger than the sum of its proper divisors (19397).

111643 is an equidigital number, since it uses as much as digits as its factorization.

111643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437.

The product of its digits is 72, while the sum is 16.

The square root of 111643 is about 334.1302141381. The cubic root of 111643 is about 48.1515752473.

Adding to 111643 its reverse (346111), we get a palindrome (457754).

The spelling of 111643 in words is "one hundred eleven thousand, six hundred forty-three".