1231231489 has 2 divisors, whose sum is σ = 1231231490. Its totient is φ = 1231231488.

The previous prime is 1231231481. The next prime is 1231231531. The reversal of 1231231489 is 9841321321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1227311089 + 3920400 = 35033^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231231489 - 2³ = 1231231481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231231481) 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, 615615744 + 615615745.

It is an arithmetic number, because the mean of its divisors is an integer number (615615745).

Almost surely, 2^1231231489 is an apocalyptic number.

It is an amenable number.

1231231489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231231489 is an equidigital number, since it uses as much as digits as its factorization.

1231231489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 1231231489 is about 35088.9083472256. The cubic root of 1231231489 is about 1071.7987298608.

The spelling of 1231231489 in words is "one billion, two hundred thirty-one million, two hundred thirty-one thousand, four hundred eighty-nine".