231489 has 18 divisors (see below), whose sum is σ = 359190. Its totient is φ = 143616.

The previous prime is 231481. The next prime is 231493. The reversal of 231489 is 984132.

It can be written as a sum of positive squares in 3 ways, for example, as 57600 + 173889 = 240^2 + 417^2 .

It is not a de Polignac number, because 231489 - 2³ = 231481 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231489.

It is not an unprimeable number, because it can be changed into a prime (231481) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2557 + ... + 2645.

It is an arithmetic number, because the mean of its divisors is an integer number (19955).

2²³¹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

231489 is a deficient number, since it is larger than the sum of its proper divisors (127701).

231489 is a wasteful number, since it uses less digits than its factorization.

231489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 109 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 231489 is about 481.1330377349. The cubic root of 231489 is about 61.4011897332.

The spelling of 231489 in words is "two hundred thirty-one thousand, four hundred eighty-nine".