12115517 has 2 divisors, whose sum is σ = 12115518. Its totient is φ = 12115516.

The previous prime is 12115507. The next prime is 12115531. The reversal of 12115517 is 71551121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11909401 + 206116 = 3451^2 + 454^2 .

It is a cyclic number.

It is not a de Polignac number, because 12115517 - 2⁴ = 12115501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12115492 and 12115501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12115507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6057758 + 6057759.

It is an arithmetic number, because the mean of its divisors is an integer number (6057759).

Almost surely, 2^12115517 is an apocalyptic number.

It is an amenable number.

12115517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12115517 is an equidigital number, since it uses as much as digits as its factorization.

12115517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 350, while the sum is 23.

The square root of 12115517 is about 3480.7351235048. The cubic root of 12115517 is about 229.6751368266.

Adding to 12115517 its reverse (71551121), we get a palindrome (83666638).

The spelling of 12115517 in words is "twelve million, one hundred fifteen thousand, five hundred seventeen".