123230209 has 2 divisors, whose sum is σ = 123230210. Its totient is φ = 123230208.

The previous prime is 123230189. The next prime is 123230221. The reversal of 123230209 is 902032321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112360000 + 10870209 = 10600^2 + 3297^2 .

It is an emirp because it is prime and its reverse (902032321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123230209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123230209.

It is not a weakly prime, because it can be changed into another prime (123230249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61615104 + 61615105.

It is an arithmetic number, because the mean of its divisors is an integer number (61615105).

Almost surely, 2^123230209 is an apocalyptic number.

It is an amenable number.

123230209 is a deficient number, since it is larger than the sum of its proper divisors (1).

123230209 is an equidigital number, since it uses as much as digits as its factorization.

123230209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 123230209 is about 11100.9102779907. The cubic root of 123230209 is about 497.6290536643.

The spelling of 123230209 in words is "one hundred twenty-three million, two hundred thirty thousand, two hundred nine".