123224809 has 2 divisors, whose sum is σ = 123224810. Its totient is φ = 123224808.

The previous prime is 123224779. The next prime is 123224821. The reversal of 123224809 is 908422321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120890025 + 2334784 = 10995^2 + 1528^2 .

It is a cyclic number.

It is not a de Polignac number, because 123224809 - 2⁷ = 123224681 is a prime.

It is not a weakly prime, because it can be changed into another prime (123221809) 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, 61612404 + 61612405.

It is an arithmetic number, because the mean of its divisors is an integer number (61612405).

Almost surely, 2^123224809 is an apocalyptic number.

It is an amenable number.

123224809 is a deficient number, since it is larger than the sum of its proper divisors (1).

123224809 is an equidigital number, since it uses as much as digits as its factorization.

123224809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 123224809 is about 11100.6670520289. The cubic root of 123224809 is about 497.6217847861.

The spelling of 123224809 in words is "one hundred twenty-three million, two hundred twenty-four thousand, eight hundred nine".