123424109 has 2 divisors, whose sum is σ = 123424110. Its totient is φ = 123424108.

The previous prime is 123424099. The next prime is 123424111. The reversal of 123424109 is 901424321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107702884 + 15721225 = 10378^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 123424109 - 2¹² = 123420013 is a prime.

Together with 123424111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123724109) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61712054 + 61712055.

It is an arithmetic number, because the mean of its divisors is an integer number (61712055).

Almost surely, 2^123424109 is an apocalyptic number.

It is an amenable number.

123424109 is a deficient number, since it is larger than the sum of its proper divisors (1).

123424109 is an equidigital number, since it uses as much as digits as its factorization.

123424109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 123424109 is about 11109.6403632161. The cubic root of 123424109 is about 497.8899196485.

The spelling of 123424109 in words is "one hundred twenty-three million, four hundred twenty-four thousand, one hundred nine".