1312311321 has 8 divisors (see below), whose sum is σ = 1944164960. Its totient is φ = 874874196.

The previous prime is 1312311317. The next prime is 1312311331. The reversal of 1312311321 is 1231132131.

1312311321 is a `hidden beast` number, since 1 + 31 + 2 + 311 + 321 = 666.

It is not a de Polignac number, because 1312311321 - 2² = 1312311317 is a prime.

It is a super-2 number, since 2×1312311321² = 3444322006449530082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312311294 and 1312311303.

It is not an unprimeable number, because it can be changed into a prime (1312311331) 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, 24302035 + ... + 24302088.

It is an arithmetic number, because the mean of its divisors is an integer number (243020620).

Almost surely, 2^1312311321 is an apocalyptic number.

It is an amenable number.

1312311321 is a deficient number, since it is larger than the sum of its proper divisors (631853639).

1312311321 is an equidigital number, since it uses as much as digits as its factorization.

1312311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48604132 (or 48604126 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1312311321 is about 36225.8377542880. The cubic root of 1312311321 is about 1094.8273174868.

Adding to 1312311321 its reverse (1231132131), we get a palindrome (2543443452).

The spelling of 1312311321 in words is "one billion, three hundred twelve million, three hundred eleven thousand, three hundred twenty-one".