1321185589 has 2 divisors, whose sum is σ = 1321185590. Its totient is φ = 1321185588.

The previous prime is 1321185521. The next prime is 1321185601. The reversal of 1321185589 is 9855811231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1236084964 + 85100625 = 35158^2 + 9225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321185589 - 2¹¹ = 1321183541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321180589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660592794 + 660592795.

It is an arithmetic number, because the mean of its divisors is an integer number (660592795).

Almost surely, 2^1321185589 is an apocalyptic number.

It is an amenable number.

1321185589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321185589 is an equidigital number, since it uses as much as digits as its factorization.

1321185589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 43.

The square root of 1321185589 is about 36348.1167187517. The cubic root of 1321185589 is about 1097.2896327304.

The spelling of 1321185589 in words is "one billion, three hundred twenty-one million, one hundred eighty-five thousand, five hundred eighty-nine".