1243020231205 has 16 divisors (see below), whose sum is σ = 1504864646208. Its totient is φ = 985608000000.

The previous prime is 1243020231199. The next prime is 1243020231209. The reversal of 1243020231205 is 5021320203421.

It is not a de Polignac number, because 1243020231205 - 2¹⁹ = 1243019706917 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 1243020231205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243020231209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 638796 + ... + 1701205.

It is an arithmetic number, because the mean of its divisors is an integer number (94054040388).

Almost surely, 2^{1243020231205} is an apocalyptic number.

It is an amenable number.

1243020231205 is a deficient number, since it is larger than the sum of its proper divisors (261844415003).

1243020231205 is a wasteful number, since it uses less digits than its factorization.

1243020231205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340948.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 1243020231205 its reverse (5021320203421), we get a palindrome (6264340434626).

The spelling of 1243020231205 in words is "one trillion, two hundred forty-three billion, twenty million, two hundred thirty-one thousand, two hundred five".