12115997 has 4 divisors (see below), whose sum is σ = 12533820. Its totient is φ = 11698176.

The previous prime is 12115969. The next prime is 12116011. The reversal of 12115997 is 79951121.

12115997 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79951121 = 1429 ⋅55949.

It can be written as a sum of positive squares in 2 ways, for example, as 8031556 + 4084441 = 2834^2 + 2021^2 .

It is a cyclic number.

It is not a de Polignac number, because 12115997 - 2⁶ = 12115933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12115907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208868 + ... + 208925.

It is an arithmetic number, because the mean of its divisors is an integer number (3133455).

Almost surely, 2^12115997 is an apocalyptic number.

It is an amenable number.

12115997 is a deficient number, since it is larger than the sum of its proper divisors (417823).

12115997 is an equidigital number, since it uses as much as digits as its factorization.

12115997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417822.

The product of its digits is 5670, while the sum is 35.

The square root of 12115997 is about 3480.8040737738. The cubic root of 12115997 is about 229.6781699235.

The spelling of 12115997 in words is "twelve million, one hundred fifteen thousand, nine hundred ninety-seven".