1280291 has 2 divisors, whose sum is σ = 1280292. Its totient is φ = 1280290.

The previous prime is 1280281. The next prime is 1280297. The reversal of 1280291 is 1920821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280291 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1280297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640145 + 640146.

It is an arithmetic number, because the mean of its divisors is an integer number (640146).

2^1280291 is an apocalyptic number.

1280291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280291 is an equidigital number, since it uses as much as digits as its factorization.

1280291 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 23.

The square root of 1280291 is about 1131.4994476357. The cubic root of 1280291 is about 108.5849321187.

The spelling of 1280291 in words is "one million, two hundred eighty thousand, two hundred ninety-one".