231655 has 8 divisors (see below), whose sum is σ = 281232. Its totient is φ = 183168.

The previous prime is 231643. The next prime is 231661. The reversal of 231655 is 556132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231655 - 2¹³ = 223463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319 + ... + 751.

It is an arithmetic number, because the mean of its divisors is an integer number (35154).

2²³¹⁶⁵⁵ is an apocalyptic number.

231655 is a deficient number, since it is larger than the sum of its proper divisors (49577).

231655 is a wasteful number, since it uses less digits than its factorization.

231655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545.

The product of its digits is 900, while the sum is 22.

The square root of 231655 is about 481.3055162784. The cubic root of 231655 is about 61.4158630900.

Adding to 231655 its reverse (556132), we get a palindrome (787787).

The spelling of 231655 in words is "two hundred thirty-one thousand, six hundred fifty-five".