123040513 has 2 divisors, whose sum is σ = 123040514. Its totient is φ = 123040512.

The previous prime is 123040493. The next prime is 123040517. The reversal of 123040513 is 315040321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69355584 + 53684929 = 8328^2 + 7327^2 .

It is a cyclic number.

It is not a de Polignac number, because 123040513 - 2¹⁷ = 122909441 is a prime.

It is not a weakly prime, because it can be changed into another prime (123040517) 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, 61520256 + 61520257.

It is an arithmetic number, because the mean of its divisors is an integer number (61520257).

Almost surely, 2^123040513 is an apocalyptic number.

It is an amenable number.

123040513 is a deficient number, since it is larger than the sum of its proper divisors (1).

123040513 is an equidigital number, since it uses as much as digits as its factorization.

123040513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 123040513 is about 11092.3628231320. The cubic root of 123040513 is about 497.3735786448.

Adding to 123040513 its reverse (315040321), we get a palindrome (438080834).

The spelling of 123040513 in words is "one hundred twenty-three million, forty thousand, five hundred thirteen".