12091219 has 4 divisors (see below), whose sum is σ = 13818544. Its totient is φ = 10363896.

The previous prime is 12091181. The next prime is 12091241. The reversal of 12091219 is 91219021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91219021 = 919 ⋅99259.

It is a cyclic number.

It is not a de Polignac number, because 12091219 - 2¹⁹ = 11566931 is a prime.

It is a super-2 number, since 2×12091219² = 292395153811922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12091193 and 12091202.

It is not an unprimeable number, because it can be changed into a prime (12091259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 863652 + ... + 863665.

It is an arithmetic number, because the mean of its divisors is an integer number (3454636).

Almost surely, 2^12091219 is an apocalyptic number.

12091219 is a deficient number, since it is larger than the sum of its proper divisors (1727325).

12091219 is an equidigital number, since it uses as much as digits as its factorization.

12091219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727324.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 12091219 is about 3477.2430171042. The cubic root of 12091219 is about 229.5214941509.

The spelling of 12091219 in words is "twelve million, ninety-one thousand, two hundred nineteen".