1306321 has 4 divisors (see below), whose sum is σ = 1311552. Its totient is φ = 1301092.

The previous prime is 1306313. The next prime is 1306339. The reversal of 1306321 is 1236031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1236031 = 271 ⋅4561.

It is a cyclic number.

It is not a de Polignac number, because 1306321 - 2³ = 1306313 is a prime.

It is a Duffinian number.

1306321 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1306295 and 1306304.

It is not an unprimeable number, because it can be changed into a prime (1306351) 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, 2221 + ... + 2746.

It is an arithmetic number, because the mean of its divisors is an integer number (327888).

2^1306321 is an apocalyptic number.

It is an amenable number.

1306321 is a deficient number, since it is larger than the sum of its proper divisors (5231).

1306321 is an equidigital number, since it uses as much as digits as its factorization.

1306321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5230.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1306321 is about 1142.9440056276. The cubic root of 1306321 is about 109.3158919812.

The spelling of 1306321 in words is "one million, three hundred six thousand, three hundred twenty-one".