1223549 has 2 divisors, whose sum is σ = 1223550. Its totient is φ = 1223548.

The previous prime is 1223533. The next prime is 1223561. The reversal of 1223549 is 9453221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1194649 + 28900 = 1093^2 + 170^2 .

It is an emirp because it is prime and its reverse (9453221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1223549 - 2⁴ = 1223533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223569) 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, 611774 + 611775.

It is an arithmetic number, because the mean of its divisors is an integer number (611775).

2^1223549 is an apocalyptic number.

It is an amenable number.

1223549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223549 is an equidigital number, since it uses as much as digits as its factorization.

1223549 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1223549 is about 1106.1414918536. The cubic root of 1223549 is about 106.9564850570.

The spelling of 1223549 in words is "one million, two hundred twenty-three thousand, five hundred forty-nine".