231311 has 8 divisors (see below), whose sum is σ = 246240. Its totient is φ = 216832.

The previous prime is 231299. The next prime is 231317. The reversal of 231311 is 113132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231311 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 231292 and 231301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231317) 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 7 ways as a sum of consecutive naturals, for example, 1991 + ... + 2103.

It is an arithmetic number, because the mean of its divisors is an integer number (30780).

2²³¹³¹¹ is an apocalyptic number.

231311 is a deficient number, since it is larger than the sum of its proper divisors (14929).

231311 is a wasteful number, since it uses less digits than its factorization.

231311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225.

The product of its digits is 18, while the sum is 11.

The square root of 231311 is about 480.9480221396. The cubic root of 231311 is about 61.3854478559.

Adding to 231311 its reverse (113132), we get a palindrome (344443).

It can be divided in two parts, 23131 and 1, that added together give a palindrome (23132).

The spelling of 231311 in words is "two hundred thirty-one thousand, three hundred eleven".