123005009 has 2 divisors, whose sum is σ = 123005010. Its totient is φ = 123005008.

The previous prime is 123004991. The next prime is 123005089. The reversal of 123005009 is 900500321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120670225 + 2334784 = 10985^2 + 1528^2 .

It is a cyclic number.

It is not a de Polignac number, because 123005009 - 2⁸ = 123004753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123005089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61502504 + 61502505.

It is an arithmetic number, because the mean of its divisors is an integer number (61502505).

Almost surely, 2^123005009 is an apocalyptic number.

It is an amenable number.

123005009 is a deficient number, since it is larger than the sum of its proper divisors (1).

123005009 is an equidigital number, since it uses as much as digits as its factorization.

123005009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 123005009 is about 11090.7623272704. The cubic root of 123005009 is about 497.3257341046.

The spelling of 123005009 in words is "one hundred twenty-three million, five thousand, nine".