12219539 has 2 divisors, whose sum is σ = 12219540. Its totient is φ = 12219538.

The previous prime is 12219533. The next prime is 12219541. The reversal of 12219539 is 93591221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12219539 - 2⁴ = 12219523 is a prime.

Together with 12219541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12219533) 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 as a sum of consecutive naturals, namely, 6109769 + 6109770.

It is an arithmetic number, because the mean of its divisors is an integer number (6109770).

Almost surely, 2^12219539 is an apocalyptic number.

12219539 is a deficient number, since it is larger than the sum of its proper divisors (1).

12219539 is an equidigital number, since it uses as much as digits as its factorization.

12219539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 32.

The square root of 12219539 is about 3495.6457200351. The cubic root of 12219539 is about 230.3305832202.

The spelling of 12219539 in words is "twelve million, two hundred nineteen thousand, five hundred thirty-nine".