1291439147 has 2 divisors, whose sum is σ = 1291439148. Its totient is φ = 1291439146.

The previous prime is 1291439117. The next prime is 1291439159. The reversal of 1291439147 is 7419341921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291439147 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291439117) 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, 645719573 + 645719574.

It is an arithmetic number, because the mean of its divisors is an integer number (645719574).

Almost surely, 2^1291439147 is an apocalyptic number.

1291439147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291439147 is an equidigital number, since it uses as much as digits as its factorization.

1291439147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 1291439147 is about 35936.5989904443. The cubic root of 1291439147 is about 1088.9918987818.

The spelling of 1291439147 in words is "one billion, two hundred ninety-one million, four hundred thirty-nine thousand, one hundred forty-seven".