231345089 has 2 divisors, whose sum is σ = 231345090. Its totient is φ = 231345088.

The previous prime is 231345043. The next prime is 231345091. The reversal of 231345089 is 980543132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119683600 + 111661489 = 10940^2 + 10567^2 .

It is a cyclic number.

It is not a de Polignac number, because 231345089 - 2²⁰ = 230296513 is a prime.

Together with 231345091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231345029) 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, 115672544 + 115672545.

It is an arithmetic number, because the mean of its divisors is an integer number (115672545).

Almost surely, 2^231345089 is an apocalyptic number.

It is an amenable number.

231345089 is a deficient number, since it is larger than the sum of its proper divisors (1).

231345089 is an equidigital number, since it uses as much as digits as its factorization.

231345089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 231345089 is about 15210.0325114708. The cubic root of 231345089 is about 613.8846322729.

The spelling of 231345089 in words is "two hundred thirty-one million, three hundred forty-five thousand, eighty-nine".