1243140403013 has 4 divisors (see below), whose sum is σ = 1283241706368. Its totient is φ = 1203039099660.

The previous prime is 1243140402961. The next prime is 1243140403039. The reversal of 1243140403013 is 3103040413421.

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-1243140403013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243140403613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20050651631 + ... + 20050651692.

It is an arithmetic number, because the mean of its divisors is an integer number (320810426592).

Almost surely, 2^{1243140403013} is an apocalyptic number.

It is an amenable number.

1243140403013 is a deficient number, since it is larger than the sum of its proper divisors (40101303355).

1243140403013 is an equidigital number, since it uses as much as digits as its factorization.

1243140403013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40101303354.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 1243140403013 its reverse (3103040413421), we get a palindrome (4346180816434).

The spelling of 1243140403013 in words is "one trillion, two hundred forty-three billion, one hundred forty million, four hundred three thousand, thirteen".