1291530419 has 2 divisors, whose sum is σ = 1291530420. Its totient is φ = 1291530418.

The previous prime is 1291530407. The next prime is 1291530439. The reversal of 1291530419 is 9140351921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1291530419 - 2⁴ = 1291530403 is a prime.

It is a super-2 number, since 2×1291530419² = 3336101646404631122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1291530439) 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, 645765209 + 645765210.

It is an arithmetic number, because the mean of its divisors is an integer number (645765210).

Almost surely, 2^1291530419 is an apocalyptic number.

1291530419 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291530419 is an equidigital number, since it uses as much as digits as its factorization.

1291530419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1291530419 is about 35937.8688711504. The cubic root of 1291530419 is about 1089.0175528818.

It can be divided in two parts, 12915 and 30419, that added together give a palindrome (43334).

The spelling of 1291530419 in words is "one billion, two hundred ninety-one million, five hundred thirty thousand, four hundred nineteen".