243541541 has 4 divisors (see below), whose sum is σ = 257867532. Its totient is φ = 229215552.

The previous prime is 243541537. The next prime is 243541547. The reversal of 243541541 is 145145342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145145342 = 2 ⋅72572671.

It can be written as a sum of positive squares in 2 ways, for example, as 225300100 + 18241441 = 15010^2 + 4271^2 .

It is a cyclic number.

It is not a de Polignac number, because 243541541 - 2² = 243541537 is a prime.

It is a super-3 number, since 3×243541541³ (a number of 26 digits) 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 (243541547) 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, 7162970 + ... + 7163003.

It is an arithmetic number, because the mean of its divisors is an integer number (64466883).

Almost surely, 2^243541541 is an apocalyptic number.

It is an amenable number.

243541541 is a deficient number, since it is larger than the sum of its proper divisors (14325991).

243541541 is a wasteful number, since it uses less digits than its factorization.

243541541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14325990.

The product of its digits is 9600, while the sum is 29.

The square root of 243541541 is about 15605.8175370597. The cubic root of 243541541 is about 624.4883629316.

Adding to 243541541 its reverse (145145342), we get a palindrome (388686883).

The spelling of 243541541 in words is "two hundred forty-three million, five hundred forty-one thousand, five hundred forty-one".