1321001 has 4 divisors (see below), whose sum is σ = 1441104. Its totient is φ = 1200900.

The previous prime is 1320983. The next prime is 1321007. The reversal of 1321001 is 1001231.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321001.

It is not an unprimeable number, because it can be changed into a prime (1321007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60035 + ... + 60056.

It is an arithmetic number, because the mean of its divisors is an integer number (360276).

2^1321001 is an apocalyptic number.

1321001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321001 is a deficient number, since it is larger than the sum of its proper divisors (120103).

1321001 is a wasteful number, since it uses less digits than its factorization.

1321001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120102.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 1321001 is about 1149.3480760849. The cubic root of 1321001 is about 109.7238527866.

Adding to 1321001 its reverse (1001231), we get a palindrome (2322232).

The spelling of 1321001 in words is "one million, three hundred twenty-one thousand, one".