12115817 has 4 divisors (see below), whose sum is σ = 13846656. Its totient is φ = 10384980.

The previous prime is 12115783. The next prime is 12115819. The reversal of 12115817 is 71851121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71851121 = 839 ⋅85639.

It is a cyclic number.

It is not a de Polignac number, because 12115817 - 2⁸ = 12115561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12115819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865409 + ... + 865422.

It is an arithmetic number, because the mean of its divisors is an integer number (3461664).

Almost surely, 2^12115817 is an apocalyptic number.

It is an amenable number.

12115817 is a deficient number, since it is larger than the sum of its proper divisors (1730839).

12115817 is an equidigital number, since it uses as much as digits as its factorization.

12115817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730838.

The product of its digits is 560, while the sum is 26.

The square root of 12115817 is about 3480.7782175830. The cubic root of 12115817 is about 229.6770325216.

Adding to 12115817 its reverse (71851121), we get a palindrome (83966938).

The spelling of 12115817 in words is "twelve million, one hundred fifteen thousand, eight hundred seventeen".