231646 has 4 divisors (see below), whose sum is σ = 347472. Its totient is φ = 115822.

The previous prime is 231643. The next prime is 231661. The reversal of 231646 is 646132.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 2 + 3¹¹ + 6⁵ + 1 + 4³ + 6⁶ .

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57910 + ... + 57913.

It is an arithmetic number, because the mean of its divisors is an integer number (86868).

2²³¹⁶⁴⁶ is an apocalyptic number.

231646 is a deficient number, since it is larger than the sum of its proper divisors (115826).

231646 is a wasteful number, since it uses less digits than its factorization.

231646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115825.

The product of its digits is 864, while the sum is 22.

The square root of 231646 is about 481.2961666168. The cubic root of 231646 is about 61.4150677263.

Adding to 231646 its reverse (646132), we get a palindrome (877778).

The spelling of 231646 in words is "two hundred thirty-one thousand, six hundred forty-six".