1291489 has 2 divisors, whose sum is σ = 1291490. Its totient is φ = 1291488.

The previous prime is 1291483. The next prime is 1291501. The reversal of 1291489 is 9841921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 627264 = 815^2 + 792^2 .

It is an emirp because it is prime and its reverse (9841921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1291489 - 2³ = 1291481 is a prime.

1291489 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1291481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645744 + 645745.

It is an arithmetic number, because the mean of its divisors is an integer number (645745).

2^1291489 is an apocalyptic number.

It is an amenable number.

1291489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291489 is an equidigital number, since it uses as much as digits as its factorization.

1291489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 1291489 is about 1136.4369758152. The cubic root of 1291489 is about 108.9005911267.

The spelling of 1291489 in words is "one million, two hundred ninety-one thousand, four hundred eighty-nine".