1311338989 has 2 divisors, whose sum is σ = 1311338990. Its totient is φ = 1311338988.

The previous prime is 1311338983. The next prime is 1311339061. The reversal of 1311338989 is 9898331131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1292977764 + 18361225 = 35958^2 + 4285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311338989 - 2⁹ = 1311338477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311338983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655669494 + 655669495.

It is an arithmetic number, because the mean of its divisors is an integer number (655669495).

Almost surely, 2^1311338989 is an apocalyptic number.

It is an amenable number.

1311338989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311338989 is an equidigital number, since it uses as much as digits as its factorization.

1311338989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 46.

The square root of 1311338989 is about 36212.4148462927. The cubic root of 1311338989 is about 1094.5568535498.

The spelling of 1311338989 in words is "one billion, three hundred eleven million, three hundred thirty-eight thousand, nine hundred eighty-nine".