231318 has 24 divisors (see below), whose sum is σ = 511056. Its totient is φ = 75600.

The previous prime is 231317. The next prime is 231323. The reversal of 231318 is 813132.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 231318.

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1188 + ... + 1368.

It is an arithmetic number, because the mean of its divisors is an integer number (21294).

2²³¹³¹⁸ is an apocalyptic number.

231318 is an abundant number, since it is smaller than the sum of its proper divisors (279738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231318 is a wasteful number, since it uses less digits than its factorization.

231318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 257 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 231318 is about 480.9552993782. The cubic root of 231318 is about 61.3860670710.

The spelling of 231318 in words is "two hundred thirty-one thousand, three hundred eighteen".