231329 has 6 divisors (see below), whose sum is σ = 269154. Its totient is φ = 198240.

The previous prime is 231323. The next prime is 231331. The reversal of 231329 is 923132.

231329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 200704 + 30625 = 448^2 + 175^2 .

It is not a de Polignac number, because 231329 - 2¹² = 227233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 231329.

It is not an unprimeable number, because it can be changed into a prime (231323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2312 + ... + 2409.

It is an arithmetic number, because the mean of its divisors is an integer number (44859).

2²³¹³²⁹ is an apocalyptic number.

It is an amenable number.

231329 is a deficient number, since it is larger than the sum of its proper divisors (37825).

231329 is an equidigital number, since it uses as much as digits as its factorization.

231329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4735 (or 4728 counting only the distinct ones).

The product of its digits is 324, while the sum is 20.

The square root of 231329 is about 480.9667348165. The cubic root of 231329 is about 61.3870400980.

The spelling of 231329 in words is "two hundred thirty-one thousand, three hundred twenty-nine".