1231328317 has 2 divisors, whose sum is σ = 1231328318. Its totient is φ = 1231328316.

The previous prime is 1231328281. The next prime is 1231328341. The reversal of 1231328317 is 7138231321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 893172996 + 338155321 = 29886^2 + 18389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231328317 - 2²³ = 1222939709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231328347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615664158 + 615664159.

It is an arithmetic number, because the mean of its divisors is an integer number (615664159).

Almost surely, 2^1231328317 is an apocalyptic number.

It is an amenable number.

1231328317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231328317 is an equidigital number, since it uses as much as digits as its factorization.

1231328317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 1231328317 is about 35090.2880723428. The cubic root of 1231328317 is about 1071.8268256895.

Adding to 1231328317 its reverse (7138231321), we get a palindrome (8369559638).

The spelling of 1231328317 in words is "one billion, two hundred thirty-one million, three hundred twenty-eight thousand, three hundred seventeen".