12121517 has 2 divisors, whose sum is σ = 12121518. Its totient is φ = 12121516.

The previous prime is 12121511. The next prime is 12121531. The reversal of 12121517 is 71512121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10569001 + 1552516 = 3251^2 + 1246^2 .

It is an emirp because it is prime and its reverse (71512121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12121517 - 2¹⁴ = 12105133 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 (12121511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060758 + 6060759.

It is an arithmetic number, because the mean of its divisors is an integer number (6060759).

Almost surely, 2^12121517 is an apocalyptic number.

It is an amenable number.

12121517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121517 is an equidigital number, since it uses as much as digits as its factorization.

12121517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 140, while the sum is 20.

The square root of 12121517 is about 3481.5969037210. The cubic root of 12121517 is about 229.7130447811.

Adding to 12121517 its reverse (71512121), we get a palindrome (83633638).

The spelling of 12121517 in words is "twelve million, one hundred twenty-one thousand, five hundred seventeen".