1318321 has 4 divisors (see below), whose sum is σ = 1322100. Its totient is φ = 1314544.

The previous prime is 1318313. The next prime is 1318349. The reversal of 1318321 is 1238131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 876096 + 442225 = 936^2 + 665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318321 - 2³ = 1318313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1306 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (330525).

2^1318321 is an apocalyptic number.

It is an amenable number.

1318321 is a deficient number, since it is larger than the sum of its proper divisors (3779).

1318321 is an equidigital number, since it uses as much as digits as its factorization.

1318321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3778.

The product of its digits is 144, while the sum is 19.

The square root of 1318321 is about 1148.1816058447. The cubic root of 1318321 is about 109.6496012634.

The spelling of 1318321 in words is "one million, three hundred eighteen thousand, three hundred twenty-one".