12320549 has 2 divisors, whose sum is σ = 12320550. Its totient is φ = 12320548.

The previous prime is 12320507. The next prime is 12320579. The reversal of 12320549 is 94502321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11175649 + 1144900 = 3343^2 + 1070^2 .

It is an emirp because it is prime and its reverse (94502321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12320549 is a prime.

It is a super-2 number, since 2×12320549² = 303591855322802, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12320579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6160274 + 6160275.

It is an arithmetic number, because the mean of its divisors is an integer number (6160275).

Almost surely, 2^12320549 is an apocalyptic number.

It is an amenable number.

12320549 is a deficient number, since it is larger than the sum of its proper divisors (1).

12320549 is an equidigital number, since it uses as much as digits as its factorization.

12320549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 12320549 is about 3510.0639595312. The cubic root of 12320549 is about 230.9635006642.

The spelling of 12320549 in words is "twelve million, three hundred twenty thousand, five hundred forty-nine".