123304561 has 2 divisors, whose sum is σ = 123304562. Its totient is φ = 123304560.

The previous prime is 123304523. The next prime is 123304591. The reversal of 123304561 is 165403321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94478400 + 28826161 = 9720^2 + 5369^2 .

It is a cyclic number.

It is not a de Polignac number, because 123304561 - 2¹⁷ = 123173489 is a prime.

It is not a weakly prime, because it can be changed into another prime (123304501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61652280 + 61652281.

It is an arithmetic number, because the mean of its divisors is an integer number (61652281).

Almost surely, 2^123304561 is an apocalyptic number.

It is an amenable number.

123304561 is a deficient number, since it is larger than the sum of its proper divisors (1).

123304561 is an equidigital number, since it uses as much as digits as its factorization.

123304561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 123304561 is about 11104.2586875487. The cubic root of 123304561 is about 497.7291164569.

Adding to 123304561 its reverse (165403321), we get a palindrome (288707882).

The spelling of 123304561 in words is "one hundred twenty-three million, three hundred four thousand, five hundred sixty-one".