12381517 has 2 divisors, whose sum is σ = 12381518. Its totient is φ = 12381516.

The previous prime is 12381511. The next prime is 12381557. The reversal of 12381517 is 71518321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11095561 + 1285956 = 3331^2 + 1134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12381517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12381511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6190758 + 6190759.

It is an arithmetic number, because the mean of its divisors is an integer number (6190759).

Almost surely, 2^12381517 is an apocalyptic number.

It is an amenable number.

12381517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12381517 is an equidigital number, since it uses as much as digits as its factorization.

12381517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 12381517 is about 3518.7379839937. The cubic root of 12381517 is about 231.3438467890.

Adding to 12381517 its reverse (71518321), we get a palindrome (83899838).

The spelling of 12381517 in words is "twelve million, three hundred eighty-one thousand, five hundred seventeen".