233891 has 4 divisors (see below), whose sum is σ = 267312. Its totient is φ = 200472.

The previous prime is 233881. The next prime is 233911. The reversal of 233891 is 198332.

233891 = T₂₅₅ + T₂₅₆ + ... + T₂₆₁.

233891 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 a de Polignac number, because none of the positive numbers 2^k-233891 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 233891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233851) 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, 16700 + ... + 16713.

It is an arithmetic number, because the mean of its divisors is an integer number (66828).

2²³³⁸⁹¹ is an apocalyptic number.

233891 is a deficient number, since it is larger than the sum of its proper divisors (33421).

233891 is an equidigital number, since it uses as much as digits as its factorization.

233891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33420.

The product of its digits is 1296, while the sum is 26.

The square root of 233891 is about 483.6227868908. The cubic root of 233891 is about 61.6128318408.

The spelling of 233891 in words is "two hundred thirty-three thousand, eight hundred ninety-one".