233813 has 4 divisors (see below), whose sum is σ = 237708. Its totient is φ = 229920.

The previous prime is 233777. The next prime is 233837. The reversal of 233813 is 318332.

233813 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 can be written as a sum of positive squares in 2 ways, for example, as 24964 + 208849 = 158^2 + 457^2 .

It is a cyclic number.

It is not a de Polignac number, because 233813 - 2⁸ = 233557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233113) 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, 1856 + ... + 1977.

It is an arithmetic number, because the mean of its divisors is an integer number (59427).

2²³³⁸¹³ is an apocalyptic number.

It is an amenable number.

233813 is a deficient number, since it is larger than the sum of its proper divisors (3895).

233813 is an equidigital number, since it uses as much as digits as its factorization.

233813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3894.

The product of its digits is 432, while the sum is 20.

The square root of 233813 is about 483.5421388049. The cubic root of 233813 is about 61.6059820187.

The spelling of 233813 in words is "two hundred thirty-three thousand, eight hundred thirteen".