123042109 has 2 divisors, whose sum is σ = 123042110. Its totient is φ = 123042108.

The previous prime is 123042071. The next prime is 123042121. The reversal of 123042109 is 901240321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91738084 + 31304025 = 9578^2 + 5595^2 .

It is a cyclic number.

It is not a de Polignac number, because 123042109 - 2⁷ = 123041981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123042109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123042149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61521054 + 61521055.

It is an arithmetic number, because the mean of its divisors is an integer number (61521055).

Almost surely, 2^123042109 is an apocalyptic number.

It is an amenable number.

123042109 is a deficient number, since it is larger than the sum of its proper divisors (1).

123042109 is an equidigital number, since it uses as much as digits as its factorization.

123042109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 123042109 is about 11092.4347642887. The cubic root of 123042109 is about 497.3757291690.

The spelling of 123042109 in words is "one hundred twenty-three million, forty-two thousand, one hundred nine".