1331321 has 8 divisors (see below), whose sum is σ = 1430784. Its totient is φ = 1234240.

The previous prime is 1331299. The next prime is 1331327. The reversal of 1331321 is 1231331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331296 and 1331305.

It is not an unprimeable number, because it can be changed into a prime (1331327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656 + ... + 1758.

It is an arithmetic number, because the mean of its divisors is an integer number (178848).

2^1331321 is an apocalyptic number.

It is an amenable number.

1331321 is a deficient number, since it is larger than the sum of its proper divisors (99463).

1331321 is a wasteful number, since it uses less digits than its factorization.

1331321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191.

The product of its digits is 54, while the sum is 14.

The square root of 1331321 is about 1153.8288434599. The cubic root of 1331321 is about 110.0088422644.

Adding to 1331321 its reverse (1231331), we get a palindrome (2562652).

The spelling of 1331321 in words is "one million, three hundred thirty-one thousand, three hundred twenty-one".