123816361 has 2 divisors, whose sum is σ = 123816362. Its totient is φ = 123816360.

The previous prime is 123816359. The next prime is 123816367. The reversal of 123816361 is 163618321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118265625 + 5550736 = 10875^2 + 2356^2 .

It is an emirp because it is prime and its reverse (163618321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123816361 - 2¹ = 123816359 is a prime.

Together with 123816359, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (123816367) 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, 61908180 + 61908181.

It is an arithmetic number, because the mean of its divisors is an integer number (61908181).

Almost surely, 2^123816361 is an apocalyptic number.

It is an amenable number.

123816361 is a deficient number, since it is larger than the sum of its proper divisors (1).

123816361 is an equidigital number, since it uses as much as digits as its factorization.

123816361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 123816361 is about 11127.2800360196. The cubic root of 123816361 is about 498.4168069573.

The spelling of 123816361 in words is "one hundred twenty-three million, eight hundred sixteen thousand, three hundred sixty-one".