12181225 has 24 divisors (see below), whose sum is σ = 17641728. Its totient is φ = 8169600.

The previous prime is 12181217. The next prime is 12181243. The reversal of 12181225 is 52218121.

It is not a de Polignac number, because 12181225 - 2³ = 12181217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12181196 and 12181205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7485 + ... + 8965.

It is an arithmetic number, because the mean of its divisors is an integer number (735072).

Almost surely, 2^12181225 is an apocalyptic number.

It is an amenable number.

12181225 is a deficient number, since it is larger than the sum of its proper divisors (5460503).

12181225 is a wasteful number, since it uses less digits than its factorization.

12181225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545 (or 1540 counting only the distinct ones).

The product of its digits is 320, while the sum is 22.

The square root of 12181225 is about 3490.1611710636. The cubic root of 12181225 is about 230.0895996213.

Adding to 12181225 its reverse (52218121), we get a palindrome (64399346).

It can be divided in two parts, 121 and 81225, that multiplied together give a square (9828225 = 3135²).

The spelling of 12181225 in words is "twelve million, one hundred eighty-one thousand, two hundred twenty-five".