1311321 has 16 divisors (see below), whose sum is σ = 1935360. Its totient is φ = 783120.

The previous prime is 1311311. The next prime is 1311341. The reversal of 1311321 is 1231131.

It is not a de Polignac number, because 1311321 - 2⁹ = 1310809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311297 and 1311306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311301) 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 15 ways as a sum of consecutive naturals, for example, 2356 + ... + 2858.

It is an arithmetic number, because the mean of its divisors is an integer number (120960).

2^1311321 is an apocalyptic number.

1311321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1311321 is a deficient number, since it is larger than the sum of its proper divisors (624039).

1311321 is a wasteful number, since it uses less digits than its factorization.

1311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596.

The product of its digits is 18, while the sum is 12.

The square root of 1311321 is about 1145.1292503469. The cubic root of 1311321 is about 109.4551848469.

Adding to 1311321 its reverse (1231131), we get a palindrome (2542452).

The spelling of 1311321 in words is "one million, three hundred eleven thousand, three hundred twenty-one".