243120442505 has 8 divisors (see below), whose sum is σ = 291945327432. Its totient is φ = 194362489728.

The previous prime is 243120442501. The next prime is 243120442519. The reversal of 243120442505 is 505244021342.

It can be written as a sum of positive squares in 4 ways, for example, as 103943694409 + 139176748096 = 322403^2 + 373064^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 243120442505 - 2² = 243120442501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243120442501) 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, 16725044 + ... + 16739573.

It is an arithmetic number, because the mean of its divisors is an integer number (36493165929).

Almost surely, 2^243120442505 is an apocalyptic number.

It is an amenable number.

243120442505 is a deficient number, since it is larger than the sum of its proper divisors (48824884927).

243120442505 is a wasteful number, since it uses less digits than its factorization.

243120442505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33466075.

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 243120442505 its reverse (505244021342), we get a palindrome (748364463847).

The spelling of 243120442505 in words is "two hundred forty-three billion, one hundred twenty million, four hundred forty-two thousand, five hundred five".