229991 has 4 divisors (see below), whose sum is σ = 231000. Its totient is φ = 228984.

The previous prime is 229981. The next prime is 230003. The reversal of 229991 is 199922.

229991 is nontrivially palindromic in base 12.

229991 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 199922 = 2 ⋅99961.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-229991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 229991.

It is not an unprimeable number, because it can be changed into a prime (229961) 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, 20 + ... + 678.

It is an arithmetic number, because the mean of its divisors is an integer number (57750).

2²²⁹⁹⁹¹ is an apocalyptic number.

229991 is a deficient number, since it is larger than the sum of its proper divisors (1009).

229991 is an equidigital number, since it uses as much as digits as its factorization.

229991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008.

The product of its digits is 2916, while the sum is 32.

The square root of 229991 is about 479.5737690908. The cubic root of 229991 is about 61.2684575776.

The spelling of 229991 in words is "two hundred twenty-nine thousand, nine hundred ninety-one".