1291319459 has 2 divisors, whose sum is σ = 1291319460. Its totient is φ = 1291319458.

The previous prime is 1291319339. The next prime is 1291319461. The reversal of 1291319459 is 9549131921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291319459 is a prime.

Together with 1291319461, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1291319759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645659729 + 645659730.

It is an arithmetic number, because the mean of its divisors is an integer number (645659730).

Almost surely, 2^1291319459 is an apocalyptic number.

1291319459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291319459 is an equidigital number, since it uses as much as digits as its factorization.

1291319459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 44.

The square root of 1291319459 is about 35934.9336857604. The cubic root of 1291319459 is about 1088.9582558779.

The spelling of 1291319459 in words is "one billion, two hundred ninety-one million, three hundred nineteen thousand, four hundred fifty-nine".