243541 has 4 divisors (see below), whose sum is σ = 244800. Its totient is φ = 242284.

The previous prime is 243539. The next prime is 243553. The reversal of 243541 is 145342.

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, and also an emirpimes, since its reverse is a distinct semiprime: 145342 = 2 ⋅72671.

It is a cyclic number.

It is not a de Polignac number, because 243541 - 2¹ = 243539 is a prime.

It is a super-3 number, since 3×243541³ = 43334871149368263, which contains 333 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 (243521) 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, 271 + ... + 748.

It is an arithmetic number, because the mean of its divisors is an integer number (61200).

2²⁴³⁵⁴¹ is an apocalyptic number.

It is an amenable number.

243541 is a deficient number, since it is larger than the sum of its proper divisors (1259).

243541 is a wasteful number, since it uses less digits than its factorization.

243541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258.

The product of its digits is 480, while the sum is 19.

The square root of 243541 is about 493.4987335343. The cubic root of 243541 is about 62.4487900521.

Adding to 243541 its reverse (145342), we get a palindrome (388883).

It can be divided in two parts, 243 and 541, that added together give a square (784 = 28²).

The spelling of 243541 in words is "two hundred forty-three thousand, five hundred forty-one".