1281003 has 4 divisors (see below), whose sum is σ = 1708008. Its totient is φ = 854000.

The previous prime is 1280989. The next prime is 1281029. The reversal of 1281003 is 3001821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1281003 - 2⁴ = 1280987 is a prime.

It is a D-number.

1281003 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1281043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213498 + ... + 213503.

It is an arithmetic number, because the mean of its divisors is an integer number (427002).

2^1281003 is an apocalyptic number.

1281003 is a deficient number, since it is larger than the sum of its proper divisors (427005).

1281003 is an equidigital number, since it uses as much as digits as its factorization.

1281003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427004.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1281003 is about 1131.8140306605. The cubic root of 1281003 is about 108.6050572685.

Adding to 1281003 its reverse (3001821), we get a palindrome (4282824).

The spelling of 1281003 in words is "one million, two hundred eighty-one thousand, three".