123112111 has 4 divisors (see below), whose sum is σ = 123220224. Its totient is φ = 123004000.

The previous prime is 123112103. The next prime is 123112151. The reversal of 123112111 is 111211321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111211321 = 13 ⋅8554717.

It is a cyclic number.

It is not a de Polignac number, because 123112111 - 2³ = 123112103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123112091 and 123112100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123112151) 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, 52330 + ... + 54631.

It is an arithmetic number, because the mean of its divisors is an integer number (30805056).

Almost surely, 2^123112111 is an apocalyptic number.

123112111 is a deficient number, since it is larger than the sum of its proper divisors (108113).

123112111 is a wasteful number, since it uses less digits than its factorization.

123112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108112.

The product of its digits is 12, while the sum is 13.

The square root of 123112111 is about 11095.5897094296. The cubic root of 123112111 is about 497.4700348104.

Adding to 123112111 its reverse (111211321), we get a palindrome (234323432).

The spelling of 123112111 in words is "one hundred twenty-three million, one hundred twelve thousand, one hundred eleven".