1131310321 has 4 divisors (see below), whose sum is σ = 1142973412. Its totient is φ = 1119647232.

The previous prime is 1131310319. The next prime is 1131310337. The reversal of 1131310321 is 1230131311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1230131311 = 8623 ⋅142657.

It can be written as a sum of positive squares in 2 ways, for example, as 840130225 + 291180096 = 28985^2 + 17064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131310321 - 2¹ = 1131310319 is a prime.

It is a super-2 number, since 2×1131310321² = 2559726084802246082, 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 = 1131310295 and 1131310304.

It is not an unprimeable number, because it can be changed into a prime (1131310021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5831400 + ... + 5831593.

It is an arithmetic number, because the mean of its divisors is an integer number (285743353).

Almost surely, 2^1131310321 is an apocalyptic number.

It is an amenable number.

1131310321 is a deficient number, since it is larger than the sum of its proper divisors (11663091).

1131310321 is an equidigital number, since it uses as much as digits as its factorization.

1131310321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11663090.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1131310321 is about 33634.9568306546. The cubic root of 1131310321 is about 1041.9828790553.

Adding to 1131310321 its reverse (1230131311), we get a palindrome (2361441632).

The spelling of 1131310321 in words is "one billion, one hundred thirty-one million, three hundred ten thousand, three hundred twenty-one".