1311313231 has 2 divisors, whose sum is σ = 1311313232. Its totient is φ = 1311313230.

The previous prime is 1311313229. The next prime is 1311313243. The reversal of 1311313231 is 1323131131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311313231 - 2¹ = 1311313229 is a prime.

It is a super-2 number, since 2×1311313231² = 3439084779591318722, which contains 22 as substring.

Together with 1311313229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1311313199 and 1311313208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311313331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655656615 + 655656616.

It is an arithmetic number, because the mean of its divisors is an integer number (655656616).

Almost surely, 2^1311313231 is an apocalyptic number.

1311313231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311313231 is an equidigital number, since it uses as much as digits as its factorization.

1311313231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 19.

The square root of 1311313231 is about 36212.0591930368. The cubic root of 1311313231 is about 1094.5496868853.

Adding to 1311313231 its reverse (1323131131), we get a palindrome (2634444362).

The spelling of 1311313231 in words is "one billion, three hundred eleven million, three hundred thirteen thousand, two hundred thirty-one".