1321003 has 8 divisors (see below), whose sum is σ = 1396736. Its totient is φ = 1247400.

The previous prime is 1320983. The next prime is 1321007. The reversal of 1321003 is 3001231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 838 + ... + 1828.

It is an arithmetic number, because the mean of its divisors is an integer number (174592).

2^1321003 is an apocalyptic number.

1321003 is a deficient number, since it is larger than the sum of its proper divisors (75733).

1321003 is an equidigital number, since it uses as much as digits as its factorization.

1321003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 1321003 is about 1149.3489461430. The cubic root of 1321003 is about 109.7239081607.

Adding to 1321003 its reverse (3001231), we get a palindrome (4322234).

The spelling of 1321003 in words is "one million, three hundred twenty-one thousand, three".