243115021241 has 4 divisors (see below), whose sum is σ = 244186012752. Its totient is φ = 242044029732.

The previous prime is 243115021159. The next prime is 243115021243. The reversal of 243115021241 is 142120511342.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243115021241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243115021241.

It is not an unprimeable number, because it can be changed into a prime (243115021243) 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, 535495415 + ... + 535495868.

It is an arithmetic number, because the mean of its divisors is an integer number (61046503188).

Almost surely, 2^243115021241 is an apocalyptic number.

It is an amenable number.

243115021241 is a deficient number, since it is larger than the sum of its proper divisors (1070991511).

243115021241 is a wasteful number, since it uses less digits than its factorization.

243115021241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070991510.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 243115021241 its reverse (142120511342), we get a palindrome (385235532583).

The spelling of 243115021241 in words is "two hundred forty-three billion, one hundred fifteen million, twenty-one thousand, two hundred forty-one".