123042113 has 4 divisors (see below), whose sum is σ = 123210708. Its totient is φ = 122873520.

The previous prime is 123042109. The next prime is 123042121. The reversal of 123042113 is 311240321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 117765904 + 5276209 = 10852^2 + 2297^2 .

It is a cyclic number.

It is not a de Polignac number, because 123042113 - 2² = 123042109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123042091 and 123042100.

It is not an unprimeable number, because it can be changed into a prime (123042133) 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, 83198 + ... + 84663.

It is an arithmetic number, because the mean of its divisors is an integer number (30802677).

Almost surely, 2^123042113 is an apocalyptic number.

It is an amenable number.

123042113 is a deficient number, since it is larger than the sum of its proper divisors (168595).

123042113 is an equidigital number, since it uses as much as digits as its factorization.

123042113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168594.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 123042113 is about 11092.4349445917. The cubic root of 123042113 is about 497.3757345587.

Adding to 123042113 its reverse (311240321), we get a palindrome (434282434).

The spelling of 123042113 in words is "one hundred twenty-three million, forty-two thousand, one hundred thirteen".