12151515 has 16 divisors (see below), whose sum is σ = 20586528. Its totient is φ = 6099456.

The previous prime is 12151511. The next prime is 12151523. The reversal of 12151515 is 51515121.

12151515 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12151515 - 2² = 12151511 is a prime.

12151515 is a modest number, since divided by 1515 gives 1215 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 12151491 and 12151500.

It is not an unprimeable number, because it can be changed into a prime (12151511) 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, 23572 + ... + 24081.

It is an arithmetic number, because the mean of its divisors is an integer number (1286658).

Almost surely, 2^12151515 is an apocalyptic number.

12151515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12151515 is a deficient number, since it is larger than the sum of its proper divisors (8435013).

12151515 is a wasteful number, since it uses less digits than its factorization.

12151515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47678.

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

The square root of 12151515 is about 3485.9023222116. The cubic root of 12151515 is about 229.9023845373.

Adding to 12151515 its reverse (51515121), we get a palindrome (63666636).

The spelling of 12151515 in words is "twelve million, one hundred fifty-one thousand, five hundred fifteen".