243381 has 8 divisors (see below), whose sum is σ = 335104. Its totient is φ = 156960.

The previous prime is 243367. The next prime is 243391. The reversal of 243381 is 183342.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243381 - 2¹⁰ = 242357 is a prime.

It is a super-2 number, since 2×243381² = 118468622322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1216 + ... + 1401.

It is an arithmetic number, because the mean of its divisors is an integer number (41888).

2²⁴³³⁸¹ is an apocalyptic number.

It is an amenable number.

243381 is a deficient number, since it is larger than the sum of its proper divisors (91723).

243381 is a wasteful number, since it uses less digits than its factorization.

243381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651.

The product of its digits is 576, while the sum is 21.

The square root of 243381 is about 493.3365990883. The cubic root of 243381 is about 62.4351113213.

The spelling of 243381 in words is "two hundred forty-three thousand, three hundred eighty-one".