1245311342543 has 4 divisors (see below), whose sum is σ = 1251831297408. Its totient is φ = 1238791387680.

The previous prime is 1245311342497. The next prime is 1245311342563. The reversal of 1245311342543 is 3452431135421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245311342543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1245311342497 and 1245311342506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245311342563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3259977146 + ... + 3259977527.

It is an arithmetic number, because the mean of its divisors is an integer number (312957824352).

Almost surely, 2^{1245311342543} is an apocalyptic number.

1245311342543 is a deficient number, since it is larger than the sum of its proper divisors (6519954865).

1245311342543 is an equidigital number, since it uses as much as digits as its factorization.

1245311342543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6519954864.

The product of its digits is 172800, while the sum is 38.

Adding to 1245311342543 its reverse (3452431135421), we get a palindrome (4697742477964).

The spelling of 1245311342543 in words is "one trillion, two hundred forty-five billion, three hundred eleven million, three hundred forty-two thousand, five hundred forty-three".