230991 has 8 divisors (see below), whose sum is σ = 316464. Its totient is φ = 149760.

The previous prime is 230977. The next prime is 230999. The reversal of 230991 is 199032.

It is a happy number.

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

It is not a de Polignac number, because 230991 - 2⁵ = 230959 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

230991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (230999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 930 + ... + 1151.

It is an arithmetic number, because the mean of its divisors is an integer number (39558).

2²³⁰⁹⁹¹ is an apocalyptic number.

230991 is a deficient number, since it is larger than the sum of its proper divisors (85473).

230991 is a wasteful number, since it uses less digits than its factorization.

230991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 230991 is about 480.6152307200. The cubic root of 230991 is about 61.3571275301.

It can be divided in two parts, 230 and 991, that added together give a palindrome (1221).

The spelling of 230991 in words is "two hundred thirty thousand, nine hundred ninety-one".