12205649 has 2 divisors, whose sum is σ = 12205650. Its totient is φ = 12205648.

The previous prime is 12205621. The next prime is 12205691. The reversal of 12205649 is 94650221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7879249 + 4326400 = 2807^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 12205649 - 2⁸ = 12205393 is a prime.

It is a super-2 number, since 2×12205649² = 297955735022402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12205849) 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, 6102824 + 6102825.

It is an arithmetic number, because the mean of its divisors is an integer number (6102825).

Almost surely, 2^12205649 is an apocalyptic number.

It is an amenable number.

12205649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12205649 is an equidigital number, since it uses as much as digits as its factorization.

12205649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 12205649 is about 3493.6583977258. The cubic root of 12205649 is about 230.2432775593.

The spelling of 12205649 in words is "twelve million, two hundred five thousand, six hundred forty-nine".