123111 has 6 divisors (see below), whose sum is σ = 177840. Its totient is φ = 82068.

The previous prime is 123091. The next prime is 123113. The reversal of 123111 is 111321.

It is not a de Polignac number, because 123111 - 2⁹ = 122599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 13679 = 123111 / (1 + 2 + 3 + 1 + 1 + 1).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 123093 and 123102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6831 + ... + 6848.

It is an arithmetic number, because the mean of its divisors is an integer number (29640).

2¹²³¹¹¹ is an apocalyptic number.

123111 is a deficient number, since it is larger than the sum of its proper divisors (54729).

123111 is a wasteful number, since it uses less digits than its factorization.

123111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13685 (or 13682 counting only the distinct ones).

The product of its digits is 6, while the sum is 9.

The square root of 123111 is about 350.8717714493. The cubic root of 123111 is about 49.7468538367.

Adding to 123111 its reverse (111321), we get a palindrome (234432).

The spelling of 123111 in words is "one hundred twenty-three thousand, one hundred eleven", and thus it is an iban number.