111559 has 4 divisors (see below), whose sum is σ = 127504. Its totient is φ = 95616.

The previous prime is 111539. The next prime is 111577. The reversal of 111559 is 955111.

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

It is a cyclic number.

It is not a de Polignac number, because 111559 - 2⁷ = 111431 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7962 + ... + 7975.

It is an arithmetic number, because the mean of its divisors is an integer number (31876).

2¹¹¹⁵⁵⁹ is an apocalyptic number.

111559 is a deficient number, since it is larger than the sum of its proper divisors (15945).

111559 is an equidigital number, since it uses as much as digits as its factorization.

111559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15944.

The product of its digits is 225, while the sum is 22.

The square root of 111559 is about 334.0044909878. The cubic root of 111559 is about 48.1394958300.

The spelling of 111559 in words is "one hundred eleven thousand, five hundred fifty-nine".