123416809 has 2 divisors, whose sum is σ = 123416810. Its totient is φ = 123416808.

The previous prime is 123416801. The next prime is 123416819. The reversal of 123416809 is 908614321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89718784 + 33698025 = 9472^2 + 5805^2 .

It is an emirp because it is prime and its reverse (908614321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123416809 - 2³ = 123416801 is a prime.

It is not a weakly prime, because it can be changed into another prime (123416801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61708404 + 61708405.

It is an arithmetic number, because the mean of its divisors is an integer number (61708405).

Almost surely, 2^123416809 is an apocalyptic number.

It is an amenable number.

123416809 is a deficient number, since it is larger than the sum of its proper divisors (1).

123416809 is an equidigital number, since it uses as much as digits as its factorization.

123416809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 123416809 is about 11109.3118148695. The cubic root of 123416809 is about 497.8801034462.

The spelling of 123416809 in words is "one hundred twenty-three million, four hundred sixteen thousand, eight hundred nine".