1291538419 has 2 divisors, whose sum is σ = 1291538420. Its totient is φ = 1291538418.

The previous prime is 1291538393. The next prime is 1291538477. The reversal of 1291538419 is 9148351921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1291538419 - 2¹⁵ = 1291505651 is a prime.

It is a super-2 number, since 2×1291538419² = 3336142975506039122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1291530419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645769209 + 645769210.

It is an arithmetic number, because the mean of its divisors is an integer number (645769210).

Almost surely, 2^1291538419 is an apocalyptic number.

1291538419 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291538419 is an equidigital number, since it uses as much as digits as its factorization.

1291538419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 1291538419 is about 35937.9801741834. The cubic root of 1291538419 is about 1089.0198014086.

The spelling of 1291538419 in words is "one billion, two hundred ninety-one million, five hundred thirty-eight thousand, four hundred nineteen".