12181226 has 4 divisors (see below), whose sum is σ = 18271842. Its totient is φ = 6090612.

The previous prime is 12181217. The next prime is 12181243. The reversal of 12181226 is 62218121.

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

It can be written as a sum of positive squares in only one way, i.e., 9916201 + 2265025 = 3149^2 + 1505^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3045305 + ... + 3045308.

Almost surely, 2^12181226 is an apocalyptic number.

12181226 is a deficient number, since it is larger than the sum of its proper divisors (6090616).

12181226 is an equidigital number, since it uses as much as digits as its factorization.

12181226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6090615.

The product of its digits is 384, while the sum is 23.

The square root of 12181226 is about 3490.1613143235. The cubic root of 12181226 is about 230.0896059176.

Adding to 12181226 its reverse (62218121), we get a palindrome (74399347).

It can be divided in two parts, 12 and 181226, that multiplied together give a palindrome (2174712).

The spelling of 12181226 in words is "twelve million, one hundred eighty-one thousand, two hundred twenty-six".