1243112542543 has 4 divisors (see below), whose sum is σ = 1243503338728. Its totient is φ = 1242721746360.

The previous prime is 1243112542541. The next prime is 1243112542579. The reversal of 1243112542543 is 3452452113421.

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

It is a cyclic number.

It is not a de Polignac number, because 1243112542543 - 2¹ = 1243112542541 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 (1243112542541) 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, 195393321 + ... + 195399682.

It is an arithmetic number, because the mean of its divisors is an integer number (310875834682).

Almost surely, 2^{1243112542543} is an apocalyptic number.

1243112542543 is a deficient number, since it is larger than the sum of its proper divisors (390796185).

1243112542543 is an equidigital number, since it uses as much as digits as its factorization.

1243112542543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390796184.

The product of its digits is 115200, while the sum is 37.

Adding to 1243112542543 its reverse (3452452113421), we get a palindrome (4695564655964).

The spelling of 1243112542543 in words is "one trillion, two hundred forty-three billion, one hundred twelve million, five hundred forty-two thousand, five hundred forty-three".