12081518 has 4 divisors (see below), whose sum is σ = 18122280. Its totient is φ = 6040758.

The previous prime is 12081497. The next prime is 12081523. The reversal of 12081518 is 81518021.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3020378 + ... + 3020381.

It is an arithmetic number, because the mean of its divisors is an integer number (4530570).

Almost surely, 2^12081518 is an apocalyptic number.

12081518 is a deficient number, since it is larger than the sum of its proper divisors (6040762).

12081518 is an equidigital number, since it uses as much as digits as its factorization.

12081518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6040761.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 12081518 is about 3475.8478102472. The cubic root of 12081518 is about 229.4600946687.

Adding to 12081518 its reverse (81518021), we get a palindrome (93599539).

The spelling of 12081518 in words is "twelve million, eighty-one thousand, five hundred eighteen".