1291140589 has 2 divisors, whose sum is σ = 1291140590. Its totient is φ = 1291140588.

The previous prime is 1291140583. The next prime is 1291140623. The reversal of 1291140589 is 9850411921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 928238089 + 362902500 = 30467^2 + 19050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291140589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291140583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645570294 + 645570295.

It is an arithmetic number, because the mean of its divisors is an integer number (645570295).

Almost surely, 2^1291140589 is an apocalyptic number.

It is an amenable number.

1291140589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291140589 is an equidigital number, since it uses as much as digits as its factorization.

1291140589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1291140589 is about 35932.4447957553. Note that the first 3 decimals coincide. The cubic root of 1291140589 is about 1088.9079737276.

The spelling of 1291140589 in words is "one billion, two hundred ninety-one million, one hundred forty thousand, five hundred eighty-nine".