1311331297 has 2 divisors, whose sum is σ = 1311331298. Its totient is φ = 1311331296.

The previous prime is 1311331291. The next prime is 1311331321. The reversal of 1311331297 is 7921331131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1290318241 + 21013056 = 35921^2 + 4584^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311331297 - 2³ = 1311331289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311331291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655665648 + 655665649.

It is an arithmetic number, because the mean of its divisors is an integer number (655665649).

Almost surely, 2^1311331297 is an apocalyptic number.

It is an amenable number.

1311331297 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311331297 is an equidigital number, since it uses as much as digits as its factorization.

1311331297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 31.

The square root of 1311331297 is about 36212.3086394668. The cubic root of 1311331297 is about 1094.5547134096.

The spelling of 1311331297 in words is "one billion, three hundred eleven million, three hundred thirty-one thousand, two hundred ninety-seven".