12115515 has 16 divisors (see below), whose sum is σ = 19704096. Its totient is φ = 6355200.

The previous prime is 12115507. The next prime is 12115517. The reversal of 12115515 is 51551121.

It is not a de Polignac number, because 12115515 - 2³ = 12115507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12115491 and 12115500.

It is not an unprimeable number, because it can be changed into a prime (12115517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5706 + ... + 7535.

It is an arithmetic number, because the mean of its divisors is an integer number (1231506).

Almost surely, 2^12115515 is an apocalyptic number.

12115515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12115515 is a deficient number, since it is larger than the sum of its proper divisors (7588581).

12115515 is a wasteful number, since it uses less digits than its factorization.

12115515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13310.

The product of its digits is 250, while the sum is 21.

The square root of 12115515 is about 3480.7348362092. The cubic root of 12115515 is about 229.6751241886.

Adding to 12115515 its reverse (51551121), we get a palindrome (63666636).

The spelling of 12115515 in words is "twelve million, one hundred fifteen thousand, five hundred fifteen".