123656513 has 2 divisors, whose sum is σ = 123656514. Its totient is φ = 123656512.

The previous prime is 123656509. The next prime is 123656539. The reversal of 123656513 is 315656321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103693489 + 19963024 = 10183^2 + 4468^2 .

It is a cyclic number.

It is not a de Polignac number, because 123656513 - 2² = 123656509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123656513.

It is not a weakly prime, because it can be changed into another prime (123656563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61828256 + 61828257.

It is an arithmetic number, because the mean of its divisors is an integer number (61828257).

Almost surely, 2^123656513 is an apocalyptic number.

It is an amenable number.

123656513 is a deficient number, since it is larger than the sum of its proper divisors (1).

123656513 is an equidigital number, since it uses as much as digits as its factorization.

123656513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 32.

The square root of 123656513 is about 11120.0950085869. The cubic root of 123656513 is about 498.2022277772.

The spelling of 123656513 in words is "one hundred twenty-three million, six hundred fifty-six thousand, five hundred thirteen".