123329809 has 2 divisors, whose sum is σ = 123329810. Its totient is φ = 123329808.

The previous prime is 123329807. The next prime is 123329813. The reversal of 123329809 is 908923321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90782784 + 32547025 = 9528^2 + 5705^2 .

It is an emirp because it is prime and its reverse (908923321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123329809 - 2¹ = 123329807 is a prime.

Together with 123329807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123329803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61664904 + 61664905.

It is an arithmetic number, because the mean of its divisors is an integer number (61664905).

Almost surely, 2^123329809 is an apocalyptic number.

It is an amenable number.

123329809 is a deficient number, since it is larger than the sum of its proper divisors (1).

123329809 is an equidigital number, since it uses as much as digits as its factorization.

123329809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 123329809 is about 11105.3954904812. The cubic root of 123329809 is about 497.7630860224.

The spelling of 123329809 in words is "one hundred twenty-three million, three hundred twenty-nine thousand, eight hundred nine".