123204161 has 2 divisors, whose sum is σ = 123204162. Its totient is φ = 123204160.

The previous prime is 123204131. The next prime is 123204173. The reversal of 123204161 is 161402321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114083761 + 9120400 = 10681^2 + 3020^2 .

It is a cyclic number.

It is not a de Polignac number, because 123204161 - 2²⁶ = 56095297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123204101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61602080 + 61602081.

It is an arithmetic number, because the mean of its divisors is an integer number (61602081).

Almost surely, 2^123204161 is an apocalyptic number.

It is an amenable number.

123204161 is a deficient number, since it is larger than the sum of its proper divisors (1).

123204161 is an equidigital number, since it uses as much as digits as its factorization.

123204161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 123204161 is about 11099.7369788658. The cubic root of 123204161 is about 497.5939887910.

Adding to 123204161 its reverse (161402321), we get a palindrome (284606482).

The spelling of 123204161 in words is "one hundred twenty-three million, two hundred four thousand, one hundred sixty-one".