231105 has 32 divisors (see below), whose sum is σ = 442368. Its totient is φ = 100800.

The previous prime is 231079. The next prime is 231107. The reversal of 231105 is 501132.

It is not a de Polignac number, because 231105 - 2⁶ = 231041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3220 + ... + 3290.

It is an arithmetic number, because the mean of its divisors is an integer number (13824).

2²³¹¹⁰⁵ is an apocalyptic number.

It is an amenable number.

231105 is a deficient number, since it is larger than the sum of its proper divisors (211263).

231105 is a wasteful number, since it uses less digits than its factorization.

231105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 231105 is about 480.7338140801. The cubic root of 231105 is about 61.3672196436.

Adding to 231105 its reverse (501132), we get a palindrome (732237).

It can be divided in two parts, 23 and 1105, that added together give a triangular number (1128 = T₄₇).

The spelling of 231105 in words is "two hundred thirty-one thousand, one hundred five".