1243883115205 has 4 divisors (see below), whose sum is σ = 1492659738252. Its totient is φ = 995106492160.

The previous prime is 1243883115203. The next prime is 1243883115253. The reversal of 1243883115205 is 5025113883421.

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 828742584609 + 415140530596 = 910353^2 + 644314^2 .

It is not a de Polignac number, because 1243883115205 - 2¹ = 1243883115203 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 (1243883115203) 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, 124388311516 + ... + 124388311525.

It is an arithmetic number, because the mean of its divisors is an integer number (373164934563).

Almost surely, 2^{1243883115205} is an apocalyptic number.

It is an amenable number.

1243883115205 is a deficient number, since it is larger than the sum of its proper divisors (248776623047).

1243883115205 is an equidigital number, since it uses as much as digits as its factorization.

1243883115205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248776623046.

The product of its (nonzero) digits is 230400, while the sum is 43.

Adding to 1243883115205 its reverse (5025113883421), we get a palindrome (6268996998626).

The spelling of 1243883115205 in words is "one trillion, two hundred forty-three billion, eight hundred eighty-three million, one hundred fifteen thousand, two hundred five".