12181825 has 12 divisors (see below), whose sum is σ = 15320448. Its totient is φ = 9606800.

The previous prime is 12181823. The next prime is 12181837. The reversal of 12181825 is 52818121.

It is not a de Polignac number, because 12181825 - 2¹ = 12181823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12181793 and 12181802.

It is not an unprimeable number, because it can be changed into a prime (12181823) 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 11 ways as a sum of consecutive naturals, for example, 1657 + ... + 5206.

It is an arithmetic number, because the mean of its divisors is an integer number (1276704).

Almost surely, 2^12181825 is an apocalyptic number.

It is an amenable number.

12181825 is a deficient number, since it is larger than the sum of its proper divisors (3138623).

12181825 is an equidigital number, since it uses as much as digits as its factorization.

12181825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6944 (or 6939 counting only the distinct ones).

The product of its digits is 1280, while the sum is 28.

The square root of 12181825 is about 3490.2471259210. The cubic root of 12181825 is about 230.0933773337.

Adding to 12181825 its reverse (52818121), we get a palindrome (64999946).

The spelling of 12181825 in words is "twelve million, one hundred eighty-one thousand, eight hundred twenty-five".