243552541 has 4 divisors (see below), whose sum is σ = 244115452. Its totient is φ = 242989632.

The previous prime is 243552521. The next prime is 243552593. The reversal of 243552541 is 145255342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41088100 + 202464441 = 6410^2 + 14229^2 .

It is a cyclic number.

It is not a de Polignac number, because 243552541 - 2⁵ = 243552509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243552521) 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, 280806 + ... + 281671.

It is an arithmetic number, because the mean of its divisors is an integer number (61028863).

Almost surely, 2^243552541 is an apocalyptic number.

It is an amenable number.

243552541 is a deficient number, since it is larger than the sum of its proper divisors (562911).

243552541 is an equidigital number, since it uses as much as digits as its factorization.

243552541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562910.

The product of its digits is 24000, while the sum is 31.

The square root of 243552541 is about 15606.1699657539. The cubic root of 243552541 is about 624.4977648439.

It can be divided in two parts, 24355 and 2541, that added together give a square (26896 = 164²).

The spelling of 243552541 in words is "two hundred forty-three million, five hundred fifty-two thousand, five hundred forty-one".