1312321 has 4 divisors (see below), whose sum is σ = 1330372. Its totient is φ = 1294272.

The previous prime is 1312319. The next prime is 1312331. The reversal of 1312321 is 1232131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1232131 = 19 ⋅64849.

It can be written as a sum of positive squares in 2 ways, for example, as 703921 + 608400 = 839^2 + 780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312321 - 2¹ = 1312319 is a prime.

It is an Ulam number.

It is a Duffinian number.

1312321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1312301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8916 + ... + 9061.

It is an arithmetic number, because the mean of its divisors is an integer number (332593).

2^1312321 is an apocalyptic number.

It is an amenable number.

1312321 is a deficient number, since it is larger than the sum of its proper divisors (18051).

1312321 is an equidigital number, since it uses as much as digits as its factorization.

1312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18050.

The product of its digits is 36, while the sum is 13.

The square root of 1312321 is about 1145.5657990705. The cubic root of 1312321 is about 109.4830009126.

Adding to 1312321 its reverse (1232131), we get a palindrome (2544452).

The spelling of 1312321 in words is "one million, three hundred twelve thousand, three hundred twenty-one".