123118 has 4 divisors (see below), whose sum is σ = 184680. Its totient is φ = 61558.

The previous prime is 123113. The next prime is 123121. The reversal of 123118 is 811321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 811321 = 7 ⋅115903.

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 as a sum of consecutive naturals, namely, 30778 + ... + 30781.

It is an arithmetic number, because the mean of its divisors is an integer number (46170).

2¹²³¹¹⁸ is an apocalyptic number.

123118 is a deficient number, since it is larger than the sum of its proper divisors (61562).

123118 is an equidigital number, since it uses as much as digits as its factorization.

123118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61561.

The product of its digits is 48, while the sum is 16.

The square root of 123118 is about 350.8817464617. The cubic root of 123118 is about 49.7477966752.

Adding to 123118 its reverse (811321), we get a palindrome (934439).

The spelling of 123118 in words is "one hundred twenty-three thousand, one hundred eighteen".