1311342947 has 2 divisors, whose sum is σ = 1311342948. Its totient is φ = 1311342946.

The previous prime is 1311342919. The next prime is 1311342983. The reversal of 1311342947 is 7492431131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311342947 - 2¹² = 1311338851 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311342917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655671473 + 655671474.

It is an arithmetic number, because the mean of its divisors is an integer number (655671474).

Almost surely, 2^1311342947 is an apocalyptic number.

1311342947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311342947 is an equidigital number, since it uses as much as digits as its factorization.

1311342947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 1311342947 is about 36212.4694960175. The cubic root of 1311342947 is about 1094.5579547783.

The spelling of 1311342947 in words is "one billion, three hundred eleven million, three hundred forty-two thousand, nine hundred forty-seven".