1231322321 has 2 divisors, whose sum is σ = 1231322322. Its totient is φ = 1231322320.

The previous prime is 1231322293. The next prime is 1231322333. The reversal of 1231322321 is 1232231321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 787588096 + 443734225 = 28064^2 + 21065^2 .

It is an emirp because it is prime and its reverse (1232231321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231322321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231322293 and 1231322302.

It is not a weakly prime, because it can be changed into another prime (1231322381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615661160 + 615661161.

It is an arithmetic number, because the mean of its divisors is an integer number (615661161).

Almost surely, 2^1231322321 is an apocalyptic number.

It is an amenable number.

1231322321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231322321 is an equidigital number, since it uses as much as digits as its factorization.

1231322321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 1231322321 is about 35090.2026354936. The cubic root of 1231322321 is about 1071.8250859195.

Adding to 1231322321 its reverse (1232231321), we get a palindrome (2463553642).

The spelling of 1231322321 in words is "one billion, two hundred thirty-one million, three hundred twenty-two thousand, three hundred twenty-one".