231165 has 24 divisors (see below), whose sum is σ = 438048. Its totient is φ = 111840.

The previous prime is 231131. The next prime is 231169. The reversal of 231165 is 561132.

231165 = T₂₁₀ + T₂₁₁ + ... + T₂₁₉.

It is not a de Polignac number, because 231165 - 2⁹ = 230653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262 + ... + 728.

It is an arithmetic number, because the mean of its divisors is an integer number (18252).

2²³¹¹⁶⁵ is an apocalyptic number.

It is an amenable number.

231165 is a deficient number, since it is larger than the sum of its proper divisors (206883).

231165 is a wasteful number, since it uses less digits than its factorization.

231165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 486 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 231165 is about 480.7962146274. The cubic root of 231165 is about 61.3725299493.

Adding to 231165 its reverse (561132), we get a palindrome (792297).

The spelling of 231165 in words is "two hundred thirty-one thousand, one hundred sixty-five".