1280603 has 2 divisors, whose sum is σ = 1280604. Its totient is φ = 1280602.

The previous prime is 1280597. The next prime is 1280623. The reversal of 1280603 is 3060821.

It is an a-pointer prime, because the next prime (1280623) can be obtained adding 1280603 to its sum of digits (20).

It is a weak prime.

It is an emirp because it is prime and its reverse (3060821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1280623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640301 + 640302.

It is an arithmetic number, because the mean of its divisors is an integer number (640302).

2^1280603 is an apocalyptic number.

1280603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280603 is an equidigital number, since it uses as much as digits as its factorization.

1280603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1280603 is about 1131.6373093885. The cubic root of 1280603 is about 108.5937519228.

The spelling of 1280603 in words is "one million, two hundred eighty thousand, six hundred three".