12219505 has 4 divisors (see below), whose sum is σ = 14663412. Its totient is φ = 9775600.

The previous prime is 12219503. The next prime is 12219511. The reversal of 12219505 is 50591221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50591221 = 257 ⋅196853.

It can be written as a sum of positive squares in 2 ways, for example, as 3640464 + 8579041 = 1908^2 + 2929^2 .

It is not a de Polignac number, because 12219505 - 2¹ = 12219503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12219505.

It is not an unprimeable number, because it can be changed into a prime (12219503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1221946 + ... + 1221955.

It is an arithmetic number, because the mean of its divisors is an integer number (3665853).

Almost surely, 2^12219505 is an apocalyptic number.

It is an amenable number.

12219505 is a deficient number, since it is larger than the sum of its proper divisors (2443907).

12219505 is an equidigital number, since it uses as much as digits as its factorization.

12219505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443906.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 12219505 is about 3495.6408568387. The cubic root of 12219505 is about 230.3303695938.

The spelling of 12219505 in words is "twelve million, two hundred nineteen thousand, five hundred five".