1131320321 has 2 divisors, whose sum is σ = 1131320322. Its totient is φ = 1131320320.

The previous prime is 1131320303. The next prime is 1131320327. The reversal of 1131320321 is 1230231311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1040385025 + 90935296 = 32255^2 + 9536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131320321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131320321.

It is not a weakly prime, because it can be changed into another prime (1131320327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565660160 + 565660161.

It is an arithmetic number, because the mean of its divisors is an integer number (565660161).

Almost surely, 2^1131320321 is an apocalyptic number.

It is an amenable number.

1131320321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131320321 is an equidigital number, since it uses as much as digits as its factorization.

1131320321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1131320321 is about 33635.1054851921. The cubic root of 1131320321 is about 1041.9859491820.

Adding to 1131320321 its reverse (1230231311), we get a palindrome (2361551632).

The spelling of 1131320321 in words is "one billion, one hundred thirty-one million, three hundred twenty thousand, three hundred twenty-one".