111145 has 4 divisors (see below), whose sum is σ = 133380. Its totient is φ = 88912.

The previous prime is 111143. The next prime is 111149. The reversal of 111145 is 541111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34969 + 76176 = 187^2 + 276^2 .

It is a cyclic number.

It is not a de Polignac number, because 111145 - 2¹ = 111143 is a prime.

It is a super-2 number, since 2×111145² = 24706422050, which contains 22 as substring.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (111143) 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, 11110 + ... + 11119.

It is an arithmetic number, because the mean of its divisors is an integer number (33345).

2¹¹¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

111145 is a deficient number, since it is larger than the sum of its proper divisors (22235).

111145 is an equidigital number, since it uses as much as digits as its factorization.

111145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22234.

The product of its digits is 20, while the sum is 13.

The square root of 111145 is about 333.3841627912. The cubic root of 111145 is about 48.0798728036.

Adding to 111145 its reverse (541111), we get a palindrome (652256).

It can be divided in two parts, 1111 and 45, that added together give a square (1156 = 34²).

The spelling of 111145 in words is "one hundred eleven thousand, one hundred forty-five".