123442111 has 4 divisors (see below), whose sum is σ = 132937672. Its totient is φ = 113946552.

The previous prime is 123442097. The next prime is 123442129. The reversal of 123442111 is 111244321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123442111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123442211) 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 3 ways as a sum of consecutive naturals, for example, 4747761 + ... + 4747786.

It is an arithmetic number, because the mean of its divisors is an integer number (33234418).

Almost surely, 2^123442111 is an apocalyptic number.

123442111 is a deficient number, since it is larger than the sum of its proper divisors (9495561).

123442111 is an equidigital number, since it uses as much as digits as its factorization.

123442111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9495560.

The product of its digits is 192, while the sum is 19.

The square root of 123442111 is about 11110.4505309191. The cubic root of 123442111 is about 497.9141250183.

Adding to 123442111 its reverse (111244321), we get a palindrome (234686432).

The spelling of 123442111 in words is "one hundred twenty-three million, four hundred forty-two thousand, one hundred eleven".