111001 has 4 divisors (see below), whose sum is σ = 121104. Its totient is φ = 100900.

The previous prime is 110989. The next prime is 111029. The reversal of 111001 is 100111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111001 - 2⁵ = 110969 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (111031) 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, 5035 + ... + 5056.

It is an arithmetic number, because the mean of its divisors is an integer number (30276).

2¹¹¹⁰⁰¹ is an apocalyptic number.

111001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111001 is a deficient number, since it is larger than the sum of its proper divisors (10103).

111001 is a wasteful number, since it uses less digits than its factorization.

111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10102.

The product of its (nonzero) digits is 1, while the sum is 4.

The square root of 111001 is about 333.1681257263. The cubic root of 111001 is about 48.0590996578.

Adding to 111001 its reverse (100111), we get a palindrome (211112).

Multiplying 111001 by its reverse (100111), we get a palindrome (11112421111).

It can be divided in two parts, 11 and 1001, that multiplied together give a palindrome (11011).

The spelling of 111001 in words is "one hundred eleven thousand, one", and thus it is an iban number.