12123817 has 2 divisors, whose sum is σ = 12123818. Its totient is φ = 12123816.

The previous prime is 12123773. The next prime is 12123857. The reversal of 12123817 is 71832121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10118761 + 2005056 = 3181^2 + 1416^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123817 - 2²³ = 3735209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12123791 and 12123800.

It is not a weakly prime, because it can be changed into another prime (12123857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061908 + 6061909.

It is an arithmetic number, because the mean of its divisors is an integer number (6061909).

Almost surely, 2^12123817 is an apocalyptic number.

It is an amenable number.

12123817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123817 is an equidigital number, since it uses as much as digits as its factorization.

12123817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 25.

The square root of 12123817 is about 3481.9271962521. The cubic root of 12123817 is about 229.7275728469.

Adding to 12123817 its reverse (71832121), we get a palindrome (83955938).

The spelling of 12123817 in words is "twelve million, one hundred twenty-three thousand, eight hundred seventeen".