243881 has 4 divisors (see below), whose sum is σ = 266064. Its totient is φ = 221700.

The previous prime is 243871. The next prime is 243889. The reversal of 243881 is 188342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243881 - 2¹⁴ = 227497 is a prime.

It is a super-2 number, since 2×243881² = 118955884322, which contains 22 as substring.

It is an Ulam number.

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 243881.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243881.

It is not an unprimeable number, because it can be changed into a prime (243889) 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, 11075 + ... + 11096.

It is an arithmetic number, because the mean of its divisors is an integer number (66516).

2²⁴³⁸⁸¹ is an apocalyptic number.

It is an amenable number.

243881 is a deficient number, since it is larger than the sum of its proper divisors (22183).

243881 is a wasteful number, since it uses less digits than its factorization.

243881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22182.

The product of its digits is 1536, while the sum is 26.

The square root of 243881 is about 493.8430924899. The cubic root of 243881 is about 62.4778374754.

It can be divided in two parts, 24388 and 1, that added together give a cube (24389 = 29³).

The spelling of 243881 in words is "two hundred forty-three thousand, eight hundred eighty-one".