111445111 has 4 divisors (see below), whose sum is σ = 111512632. Its totient is φ = 111377592.

The previous prime is 111445069. The next prime is 111445129. The reversal of 111445111 is 111544111.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111445111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111445141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31221 + ... + 34606.

It is an arithmetic number, because the mean of its divisors is an integer number (27878158).

Almost surely, 2^111445111 is an apocalyptic number.

111445111 is a deficient number, since it is larger than the sum of its proper divisors (67521).

111445111 is an equidigital number, since it uses as much as digits as its factorization.

111445111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67520.

The product of its digits is 80, while the sum is 19.

The square root of 111445111 is about 10556.7566515479. The cubic root of 111445111 is about 481.2310860954.

Adding to 111445111 its reverse (111544111), we get a palindrome (222989222).

It can be divided in two parts, 111445 and 111, that added together give a square (111556 = 334²).

The spelling of 111445111 in words is "one hundred eleven million, four hundred forty-five thousand, one hundred eleven".