231663 has 16 divisors (see below), whose sum is σ = 331776. Its totient is φ = 143520.

The previous prime is 231661. The next prime is 231677. The reversal of 231663 is 366132.

It is not a de Polignac number, because 231663 - 2¹ = 231661 is a prime.

It is a d-powerful number, because it can be written as 2 + 3⁸ + 6⁴ + 1 + 6⁶ + 3¹¹ .

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 (231661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4345 + ... + 4397.

It is an arithmetic number, because the mean of its divisors is an integer number (20736).

2²³¹⁶⁶³ is an apocalyptic number.

231663 is a deficient number, since it is larger than the sum of its proper divisors (100113).

231663 is a wasteful number, since it uses less digits than its factorization.

231663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134.

The product of its digits is 648, while the sum is 21.

The square root of 231663 is about 481.3138269362. The cubic root of 231663 is about 61.4165700627.

Adding to 231663 its reverse (366132), we get a palindrome (597795).

The spelling of 231663 in words is "two hundred thirty-one thousand, six hundred sixty-three".