243121440041 has 4 divisors (see below), whose sum is σ = 244138684800. Its totient is φ = 242104195284.

The previous prime is 243121440017. The next prime is 243121440083. The reversal of 243121440041 is 140044121342.

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 not a de Polignac number, because 243121440041 - 2²² = 243117245737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243121340041) 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, 508622021 + ... + 508622498.

It is an arithmetic number, because the mean of its divisors is an integer number (61034671200).

Almost surely, 2^243121440041 is an apocalyptic number.

It is an amenable number.

243121440041 is a deficient number, since it is larger than the sum of its proper divisors (1017244759).

243121440041 is a wasteful number, since it uses less digits than its factorization.

243121440041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017244758.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 243121440041 its reverse (140044121342), we get a palindrome (383165561383).

The spelling of 243121440041 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred forty thousand, forty-one".