231145589 has 2 divisors, whose sum is σ = 231145590. Its totient is φ = 231145588.

The previous prime is 231145571. The next prime is 231145601. The reversal of 231145589 is 985541132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229764964 + 1380625 = 15158^2 + 1175^2 .

It is a cyclic number.

It is not a de Polignac number, because 231145589 - 2⁸ = 231145333 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231195589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115572794 + 115572795.

It is an arithmetic number, because the mean of its divisors is an integer number (115572795).

Almost surely, 2^231145589 is an apocalyptic number.

It is an amenable number.

231145589 is a deficient number, since it is larger than the sum of its proper divisors (1).

231145589 is an equidigital number, since it uses as much as digits as its factorization.

231145589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 38.

The square root of 231145589 is about 15203.4729256180. The cubic root of 231145589 is about 613.7081207745.

The spelling of 231145589 in words is "two hundred thirty-one million, one hundred forty-five thousand, five hundred eighty-nine".