1280549 has 2 divisors, whose sum is σ = 1280550. Its totient is φ = 1280548.

The previous prime is 1280537. The next prime is 1280561. The reversal of 1280549 is 9450821.

It is a balanced prime because it is at equal distance from previous prime (1280537) and next prime (1280561).

It can be written as a sum of positive squares in only one way, i.e., 1249924 + 30625 = 1118^2 + 175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280549 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640274 + 640275.

It is an arithmetic number, because the mean of its divisors is an integer number (640275).

2^1280549 is an apocalyptic number.

It is an amenable number.

1280549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280549 is an equidigital number, since it uses as much as digits as its factorization.

1280549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1280549 is about 1131.6134499024. The cubic root of 1280549 is about 108.5922255208.

The spelling of 1280549 in words is "one million, two hundred eighty thousand, five hundred forty-nine".