243540121 has 8 divisors (see below), whose sum is σ = 270036288. Its totient is φ = 217770000.

The previous prime is 243540091. The next prime is 243540133. The reversal of 243540121 is 121045342.

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

It is not a de Polignac number, because 243540121 - 2¹⁵ = 243507353 is a prime.

It is a super-3 number, since 3×243540121³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243540092 and 243540101.

It is not an unprimeable number, because it can be changed into a prime (243540161) 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, 180805 + ... + 182146.

It is an arithmetic number, because the mean of its divisors is an integer number (33754536).

Almost surely, 2^243540121 is an apocalyptic number.

It is an amenable number.

243540121 is a deficient number, since it is larger than the sum of its proper divisors (26496167).

243540121 is a wasteful number, since it uses less digits than its factorization.

243540121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363023.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 243540121 is about 15605.7720411391. The cubic root of 243540121 is about 624.4871492096.

Adding to 243540121 its reverse (121045342), we get a palindrome (364585463).

The spelling of 243540121 in words is "two hundred forty-three million, five hundred forty thousand, one hundred twenty-one".