123009109 has 2 divisors, whose sum is σ = 123009110. Its totient is φ = 123009108.

The previous prime is 123009079. The next prime is 123009113. The reversal of 123009109 is 901900321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83356900 + 39652209 = 9130^2 + 6297^2 .

It is a cyclic number.

It is not a de Polignac number, because 123009109 - 2⁹ = 123008597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123009179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61504554 + 61504555.

It is an arithmetic number, because the mean of its divisors is an integer number (61504555).

Almost surely, 2^123009109 is an apocalyptic number.

It is an amenable number.

123009109 is a deficient number, since it is larger than the sum of its proper divisors (1).

123009109 is an equidigital number, since it uses as much as digits as its factorization.

123009109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 123009109 is about 11090.9471642417. The cubic root of 123009109 is about 497.3312596596.

The spelling of 123009109 in words is "one hundred twenty-three million, nine thousand, one hundred nine".