1311330491 has 2 divisors, whose sum is σ = 1311330492. Its totient is φ = 1311330490.

The previous prime is 1311330457. The next prime is 1311330509. The reversal of 1311330491 is 1940331131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311330491 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311330491.

It is not a weakly prime, because it can be changed into another prime (1311330791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655665245 + 655665246.

It is an arithmetic number, because the mean of its divisors is an integer number (655665246).

Almost surely, 2^1311330491 is an apocalyptic number.

1311330491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311330491 is an equidigital number, since it uses as much as digits as its factorization.

1311330491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1311330491 is about 36212.2975106524. The cubic root of 1311330491 is about 1094.5544891563.

The spelling of 1311330491 in words is "one billion, three hundred eleven million, three hundred thirty thousand, four hundred ninety-one".