1281303 has 24 divisors (see below), whose sum is σ = 1996800. Its totient is φ = 789264.

The previous prime is 1281283. The next prime is 1281317. The reversal of 1281303 is 3031821.

It is not a de Polignac number, because 1281303 - 2⁸ = 1281047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281383) 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 23 ways as a sum of consecutive naturals, for example, 10026 + ... + 10152.

It is an arithmetic number, because the mean of its divisors is an integer number (83200).

2^1281303 is an apocalyptic number.

1281303 is a deficient number, since it is larger than the sum of its proper divisors (715497).

1281303 is a wasteful number, since it uses less digits than its factorization.

1281303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1281303 is about 1131.9465535086. The cubic root of 1281303 is about 108.6135347334.

It can be divided in two parts, 128 and 1303, that added together give a triangular number (1431 = T₅₃).

The spelling of 1281303 in words is "one million, two hundred eighty-one thousand, three hundred three".