1243004323513 has 4 divisors (see below), whose sum is σ = 1271911400848. Its totient is φ = 1214097246180.

The previous prime is 1243004323507. The next prime is 1243004323607. The reversal of 1243004323513 is 3153234003421.

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 not a de Polignac number, because 1243004323513 - 2⁵ = 1243004323481 is a prime.

It is a super-2 number, since 2×1243004323513² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243004323213) 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, 14453538603 + ... + 14453538688.

It is an arithmetic number, because the mean of its divisors is an integer number (317977850212).

Almost surely, 2^{1243004323513} is an apocalyptic number.

It is an amenable number.

1243004323513 is a deficient number, since it is larger than the sum of its proper divisors (28907077335).

1243004323513 is an equidigital number, since it uses as much as digits as its factorization.

1243004323513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28907077334.

The product of its (nonzero) digits is 25920, while the sum is 31.

Adding to 1243004323513 its reverse (3153234003421), we get a palindrome (4396238326934).

The spelling of 1243004323513 in words is "one trillion, two hundred forty-three billion, four million, three hundred twenty-three thousand, five hundred thirteen".