12181345 has 16 divisors (see below), whose sum is σ = 16030080. Its totient is φ = 8812800.

The previous prime is 12181343. The next prime is 12181369. The reversal of 12181345 is 54318121.

It is not a de Polignac number, because 12181345 - 2¹ = 12181343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12181343) 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, 12796 + ... + 13714.

It is an arithmetic number, because the mean of its divisors is an integer number (1001880).

Almost surely, 2^12181345 is an apocalyptic number.

It is an amenable number.

12181345 is a deficient number, since it is larger than the sum of its proper divisors (3848735).

12181345 is a wasteful number, since it uses less digits than its factorization.

12181345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176.

The product of its digits is 960, while the sum is 25.

The square root of 12181345 is about 3490.1783622044. The cubic root of 12181345 is about 230.0903551737.

Adding to 12181345 its reverse (54318121), we get a palindrome (66499466).

The spelling of 12181345 in words is "twelve million, one hundred eighty-one thousand, three hundred forty-five".