1313111321 has 4 divisors (see below), whose sum is σ = 1313415972. Its totient is φ = 1312806672.

The previous prime is 1313111291. The next prime is 1313111323. The reversal of 1313111321 is 1231113131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1231113131 = 139 ⋅8856929.

It can be written as a sum of positive squares in 2 ways, for example, as 303142921 + 1009968400 = 17411^2 + 31780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313111321 is a prime.

It is a super-2 number, since 2×1313111321² = 3448522682676730082, which contains 22 as substring.

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 1313111321.

It is not an unprimeable number, because it can be changed into a prime (1313111323) 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, 145766 + ... + 154511.

It is an arithmetic number, because the mean of its divisors is an integer number (328353993).

Almost surely, 2^1313111321 is an apocalyptic number.

It is an amenable number.

1313111321 is a deficient number, since it is larger than the sum of its proper divisors (304651).

1313111321 is an equidigital number, since it uses as much as digits as its factorization.

1313111321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304650.

The product of its digits is 54, while the sum is 17.

The square root of 1313111321 is about 36236.8779146328. The cubic root of 1313111321 is about 1095.0497453822.

Adding to 1313111321 its reverse (1231113131), we get a palindrome (2544224452).

The spelling of 1313111321 in words is "one billion, three hundred thirteen million, one hundred eleven thousand, three hundred twenty-one".