123115 has 4 divisors (see below), whose sum is σ = 147744. Its totient is φ = 98488.

The previous prime is 123113. The next prime is 123121. The reversal of 123115 is 511321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511321 = 317 ⋅1613.

It is a cyclic number.

It is not a de Polignac number, because 123115 - 2¹ = 123113 is a prime.

It is a Duffinian number.

123115 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 123095 and 123104.

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 3 ways as a sum of consecutive naturals, for example, 12307 + ... + 12316.

It is an arithmetic number, because the mean of its divisors is an integer number (36936).

2¹²³¹¹⁵ is an apocalyptic number.

123115 is a deficient number, since it is larger than the sum of its proper divisors (24629).

123115 is an equidigital number, since it uses as much as digits as its factorization.

123115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24628.

The product of its digits is 30, while the sum is 13.

The square root of 123115 is about 350.8774714911. The cubic root of 123115 is about 49.7473926060.

Adding to 123115 its reverse (511321), we get a palindrome (634436).

The spelling of 123115 in words is "one hundred twenty-three thousand, one hundred fifteen".