12661219 has 4 divisors (see below), whose sum is σ = 12668440.
Its totient is φ = 12654000.
The previous prime is 12661213. The next prime is 12661241. The reversal of 12661219 is 91216621.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It is a cyclic number.
It is not a de Polignac number, because 12661219 - 23 = 12661211 is a prime.
It is a super-2 number, since 2×126612192 = 320612933131922, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (12661211) 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 3 ways as a sum of consecutive naturals, for example, 892 + ... + 5110.
It is an arithmetic number, because the mean of its divisors is an integer number (3167110).
Almost surely, 212661219 is an apocalyptic number.
12661219 is a deficient number, since it is larger than the sum of its proper divisors (7221).
12661219 is an equidigital number, since it uses as much as digits as its factorization.
12661219 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7220.
The product of its digits is 1296, while the sum is 28.
The square root of 12661219 is about 3558.2606706086.
The cubic root of 12661219 is about 233.0729324021.
It can be divided in two parts, 12661 and 219, that added together give a triangular number (12880 = T160).
The spelling of 12661219 in words is "twelve million, six hundred sixty-one thousand, two hundred nineteen".