123111043 has 4 divisors (see below), whose sum is σ = 134302968. Its totient is φ = 111919120.

The previous prime is 123111041. The next prime is 123111047. The reversal of 123111043 is 340111321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340111321 = 11 ⋅30919211.

It is a cyclic number.

It is not a de Polignac number, because 123111043 - 2¹ = 123111041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123111041) 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, 5595946 + ... + 5595967.

It is an arithmetic number, because the mean of its divisors is an integer number (33575742).

Almost surely, 2^123111043 is an apocalyptic number.

123111043 is a deficient number, since it is larger than the sum of its proper divisors (11191925).

123111043 is a wasteful number, since it uses less digits than its factorization.

123111043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11191924.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 123111043 is about 11095.5415820950. The cubic root of 123111043 is about 497.4685962855.

Adding to 123111043 its reverse (340111321), we get a palindrome (463222364).

The spelling of 123111043 in words is "one hundred twenty-three million, one hundred eleven thousand, forty-three".