243731 has 4 divisors (see below), whose sum is σ = 254352. Its totient is φ = 233112.

The previous prime is 243709. The next prime is 243769. The reversal of 243731 is 137342.

243731 is nontrivially palindromic in base 6.

243731 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-243731 is a prime.

It is a super-2 number, since 2×243731² = 118809600722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243701) 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, 5276 + ... + 5321.

It is an arithmetic number, because the mean of its divisors is an integer number (63588).

2²⁴³⁷³¹ is an apocalyptic number.

243731 is a deficient number, since it is larger than the sum of its proper divisors (10621).

243731 is a wasteful number, since it uses less digits than its factorization.

243731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10620.

The product of its digits is 504, while the sum is 20.

The square root of 243731 is about 493.6911990303. The cubic root of 243731 is about 62.4650257658.

The spelling of 243731 in words is "two hundred forty-three thousand, seven hundred thirty-one".