231945 has 24 divisors (see below), whose sum is σ = 433344. Its totient is φ = 103776.

The previous prime is 231943. The next prime is 231947. The reversal of 231945 is 549132.

It is an interprime number because it is at equal distance from previous prime (231943) and next prime (231947).

It is not a de Polignac number, because 231945 - 2¹ = 231943 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4912 + ... + 4958.

It is an arithmetic number, because the mean of its divisors is an integer number (18056).

2²³¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

231945 is a deficient number, since it is larger than the sum of its proper divisors (201399).

231945 is an equidigital number, since it uses as much as digits as its factorization.

231945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 62 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 231945 is about 481.6066860001. The cubic root of 231945 is about 61.4414804568.

It can be divided in two parts, 231 and 945, that added together give a triangular number (1176 = T₄₈).

The spelling of 231945 in words is "two hundred thirty-one thousand, nine hundred forty-five".