243791 has 4 divisors (see below), whose sum is σ = 245784. Its totient is φ = 241800.

The previous prime is 243787. The next prime is 243799. The reversal of 243791 is 197342.

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 243791 - 2² = 243787 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 243791.

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 243791.

It is not an unprimeable number, because it can be changed into a prime (243799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 1061.

It is an arithmetic number, because the mean of its divisors is an integer number (61446).

2²⁴³⁷⁹¹ is an apocalyptic number.

243791 is a deficient number, since it is larger than the sum of its proper divisors (1993).

243791 is a wasteful number, since it uses less digits than its factorization.

243791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992.

The product of its digits is 1512, while the sum is 26.

The square root of 243791 is about 493.7519620214. The cubic root of 243791 is about 62.4701510803.

The spelling of 243791 in words is "two hundred forty-three thousand, seven hundred ninety-one".