12219491 has 4 divisors (see below), whose sum is σ = 12287184. Its totient is φ = 12151800.

The previous prime is 12219461. The next prime is 12219497. The reversal of 12219491 is 19491221.

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

It is a cyclic number.

It is not a de Polignac number, because 12219491 - 2¹⁸ = 11957347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12219497) 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, 33575 + ... + 33936.

It is an arithmetic number, because the mean of its divisors is an integer number (3071796).

Almost surely, 2^12219491 is an apocalyptic number.

12219491 is a deficient number, since it is larger than the sum of its proper divisors (67693).

12219491 is an equidigital number, since it uses as much as digits as its factorization.

12219491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67692.

The product of its digits is 1296, while the sum is 29.

The square root of 12219491 is about 3495.6388543441. The cubic root of 12219491 is about 230.3302816299.

It can be divided in two parts, 1221 and 9491, that multiplied together give a palindrome (11588511).

The spelling of 12219491 in words is "twelve million, two hundred nineteen thousand, four hundred ninety-one".