123217609 has 2 divisors, whose sum is σ = 123217610. Its totient is φ = 123217608.

The previous prime is 123217579. The next prime is 123217631. The reversal of 123217609 is 906712321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94090000 + 29127609 = 9700^2 + 5397^2 .

It is an emirp because it is prime and its reverse (906712321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123217609 - 2⁹ = 123217097 is a prime.

It is not a weakly prime, because it can be changed into another prime (123217009) 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, 61608804 + 61608805.

It is an arithmetic number, because the mean of its divisors is an integer number (61608805).

Almost surely, 2^123217609 is an apocalyptic number.

It is an amenable number.

123217609 is a deficient number, since it is larger than the sum of its proper divisors (1).

123217609 is an equidigital number, since it uses as much as digits as its factorization.

123217609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 123217609 is about 11100.3427424562. The cubic root of 123217609 is about 497.6120926181.

The spelling of 123217609 in words is "one hundred twenty-three million, two hundred seventeen thousand, six hundred nine".