229831 has 4 divisors (see below), whose sum is σ = 262672. Its totient is φ = 196992.

The previous prime is 229819. The next prime is 229837. The reversal of 229831 is 138922.

229831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 229831 - 2⁵ = 229799 is a prime.

It is a super-2 number, since 2×229831² = 105644577122, which contains 22 as substring.

It is a Duffinian number.

229831 is a lucky number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 229796 and 229805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16410 + ... + 16423.

It is an arithmetic number, because the mean of its divisors is an integer number (65668).

2²²⁹⁸³¹ is an apocalyptic number.

229831 is a deficient number, since it is larger than the sum of its proper divisors (32841).

229831 is an equidigital number, since it uses as much as digits as its factorization.

229831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32840.

The product of its digits is 864, while the sum is 25.

The square root of 229831 is about 479.4069252733. The cubic root of 229831 is about 61.2542465472.

Subtracting from 229831 its reverse (138922), we obtain a palindrome (90909).

The spelling of 229831 in words is "two hundred twenty-nine thousand, eight hundred thirty-one".