1280311 has 4 divisors (see below), whose sum is σ = 1314952. Its totient is φ = 1245672.

The previous prime is 1280309. The next prime is 1280317. The reversal of 1280311 is 1130821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1130821 = 41 ⋅27581.

It is a cyclic number.

It is not a de Polignac number, because 1280311 - 2¹ = 1280309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280317) 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 in 3 ways as a sum of consecutive naturals, for example, 17265 + ... + 17338.

It is an arithmetic number, because the mean of its divisors is an integer number (328738).

2^1280311 is an apocalyptic number.

1280311 is a deficient number, since it is larger than the sum of its proper divisors (34641).

1280311 is an equidigital number, since it uses as much as digits as its factorization.

1280311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34640.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1280311 is about 1131.5082854314. The cubic root of 1280311 is about 108.5854975338.

The spelling of 1280311 in words is "one million, two hundred eighty thousand, three hundred eleven".