231656 has 16 divisors (see below), whose sum is σ = 453600. Its totient is φ = 110704.

The previous prime is 231643. The next prime is 231661. The reversal of 231656 is 656132.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

231656 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446 + ... + 813.

It is an arithmetic number, because the mean of its divisors is an integer number (28350).

2²³¹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

231656 is a deficient number, since it is larger than the sum of its proper divisors (221944).

231656 is a wasteful number, since it uses less digits than its factorization.

231656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288 (or 1284 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 231656 is about 481.3065551185. The cubic root of 231656 is about 61.4159514625.

Adding to 231656 its reverse (656132), we get a palindrome (887788).

The spelling of 231656 in words is "two hundred thirty-one thousand, six hundred fifty-six".