111555 has 24 divisors (see below), whose sum is σ = 201552. Its totient is φ = 57024.

The previous prime is 111539. The next prime is 111577. The reversal of 111555 is 555111.

111555 is a `hidden beast` number, since 111 + 555 = 666.

It is a Cunningham number, because it is equal to 334²-1.

It is not a de Polignac number, because 111555 - 2⁴ = 111539 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1632 + ... + 1698.

It is an arithmetic number, because the mean of its divisors is an integer number (8398).

2¹¹¹⁵⁵⁵ is an apocalyptic number.

111555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

111555 is a deficient number, since it is larger than the sum of its proper divisors (89997).

111555 is a wasteful number, since it uses less digits than its factorization.

111555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 112 counting only the distinct ones).

The product of its digits is 125, while the sum is 18.

The square root of 111555 is about 333.9985029907. The cubic root of 111555 is about 48.1389204684.

Adding to 111555 its reverse (555111), we get a palindrome (666666).

Subtracting 111555 from its reverse (555111), we obtain a square (443556 = 666²).

It can be divided in two parts, 111 and 555, that added together give a palindrome (666).

The spelling of 111555 in words is "one hundred eleven thousand, five hundred fifty-five".