123312111 has 16 divisors (see below), whose sum is σ = 179493216. Its totient is φ = 74843136.

The previous prime is 123312107. The next prime is 123312113. The reversal of 123312111 is 111213321.

It is a happy number.

It is not a de Polignac number, because 123312111 - 2² = 123312107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123312113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18810 + ... + 24503.

It is an arithmetic number, because the mean of its divisors is an integer number (11218326).

Almost surely, 2^123312111 is an apocalyptic number.

123312111 is a deficient number, since it is larger than the sum of its proper divisors (56181105).

123312111 is a wasteful number, since it uses less digits than its factorization.

123312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43402.

The product of its digits is 36, while the sum is 15.

The square root of 123312111 is about 11104.5986420041. The cubic root of 123312111 is about 497.7392749839.

Adding to 123312111 its reverse (111213321), we get a palindrome (234525432).

The spelling of 123312111 in words is "one hundred twenty-three million, three hundred twelve thousand, one hundred eleven".