1321303 has 2 divisors, whose sum is σ = 1321304. Its totient is φ = 1321302.

The previous prime is 1321301. The next prime is 1321319. The reversal of 1321303 is 3031231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321303 - 2¹ = 1321301 is a prime.

Together with 1321301, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660651 + 660652.

It is an arithmetic number, because the mean of its divisors is an integer number (660652).

2^1321303 is an apocalyptic number.

1321303 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321303 is an equidigital number, since it uses as much as digits as its factorization.

1321303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 1321303 is about 1149.4794474022. The cubic root of 1321303 is about 109.7322136379.

Adding to 1321303 its reverse (3031231), we get a palindrome (4352534).

It can be divided in two parts, 13 and 21303, that added together give a square (21316 = 146²).

The spelling of 1321303 in words is "one million, three hundred twenty-one thousand, three hundred three".