1801321 has 4 divisors (see below), whose sum is σ = 1810944. Its totient is φ = 1791700.

The previous prime is 1801309. The next prime is 1801339. The reversal of 1801321 is 1231081.

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: 1231081 = 631 ⋅1951.

It is a cyclic number.

It is not a de Polignac number, because 1801321 - 2⁹ = 1800809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1801295 and 1801304.

It is not an unprimeable number, because it can be changed into a prime (1801361) 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, 4525 + ... + 4906.

It is an arithmetic number, because the mean of its divisors is an integer number (452736).

2^1801321 is an apocalyptic number.

It is an amenable number.

1801321 is a deficient number, since it is larger than the sum of its proper divisors (9623).

1801321 is an equidigital number, since it uses as much as digits as its factorization.

1801321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9622.

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

The square root of 1801321 is about 1342.1330038413. The cubic root of 1801321 is about 121.6737903712.

The spelling of 1801321 in words is "one million, eight hundred one thousand, three hundred twenty-one".