1018321 has 4 divisors (see below), whose sum is σ = 1025892. Its totient is φ = 1010752.

The previous prime is 1018313. The next prime is 1018337. The reversal of 1018321 is 1238101.

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 287296 + 731025 = 536^2 + 855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1018321 - 2³ = 1018313 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1018295 and 1018304.

It is not an unprimeable number, because it can be changed into a prime (1018301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3580 + ... + 3853.

It is an arithmetic number, because the mean of its divisors is an integer number (256473).

2^1018321 is an apocalyptic number.

It is an amenable number.

1018321 is a deficient number, since it is larger than the sum of its proper divisors (7571).

1018321 is an equidigital number, since it uses as much as digits as its factorization.

1018321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7570.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1018321 is about 1009.1189226251. The cubic root of 1018321 is about 100.6070079581.

The spelling of 1018321 in words is "one million, eighteen thousand, three hundred twenty-one".