1296989443 has 2 divisors, whose sum is σ = 1296989444. Its totient is φ = 1296989442.

The previous prime is 1296989437. The next prime is 1296989461. The reversal of 1296989443 is 3449896921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1296989443 - 2²⁹ = 760118531 is a prime.

It is not a weakly prime, because it can be changed into another prime (1296989413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648494721 + 648494722.

It is an arithmetic number, because the mean of its divisors is an integer number (648494722).

Almost surely, 2^1296989443 is an apocalyptic number.

1296989443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1296989443 is an equidigital number, since it uses as much as digits as its factorization.

1296989443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 55.

The square root of 1296989443 is about 36013.7396419755. The cubic root of 1296989443 is about 1090.5497445718.

The spelling of 1296989443 in words is "one billion, two hundred ninety-six million, nine hundred eighty-nine thousand, four hundred forty-three".