111222165 has 16 divisors (see below), whose sum is σ = 178891776. Its totient is φ = 59006400.

The previous prime is 111222157. The next prime is 111222169. The reversal of 111222165 is 561222111.

It is not a de Polignac number, because 111222165 - 2³ = 111222157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222169) 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 15 ways as a sum of consecutive naturals, for example, 16546 + ... + 22275.

It is an arithmetic number, because the mean of its divisors is an integer number (11180736).

Almost surely, 2^111222165 is an apocalyptic number.

111222165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

111222165 is a deficient number, since it is larger than the sum of its proper divisors (67669611).

111222165 is a wasteful number, since it uses less digits than its factorization.

111222165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39020.

The product of its digits is 240, while the sum is 21.

The square root of 111222165 is about 10546.1919667717. The cubic root of 111222165 is about 480.9099708606.

Adding to 111222165 its reverse (561222111), we get a palindrome (672444276).

It can be divided in two parts, 1112221 and 65, that added together give a triangular number (1112286 = T₁₄₉₁).

The spelling of 111222165 in words is "one hundred eleven million, two hundred twenty-two thousand, one hundred sixty-five".