111649 has 4 divisors (see below), whose sum is σ = 112320. Its totient is φ = 110980.

The previous prime is 111641. The next prime is 111653. The reversal of 111649 is 946111.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 111649 - 2³ = 111641 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

111649 is a lucky number.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132 + ... + 490.

It is an arithmetic number, because the mean of its divisors is an integer number (28080).

2¹¹¹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

111649 is a deficient number, since it is larger than the sum of its proper divisors (671).

111649 is an equidigital number, since it uses as much as digits as its factorization.

111649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670.

The product of its digits is 216, while the sum is 22.

The square root of 111649 is about 334.1391925530. The cubic root of 111649 is about 48.1524378310.

The spelling of 111649 in words is "one hundred eleven thousand, six hundred forty-nine".