43135644243 has 4 divisors (see below), whose sum is σ = 57514192328. Its totient is φ = 28757096160.

The previous prime is 43135644191. The next prime is 43135644259. The reversal of 43135644243 is 34244653134.

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

It is not a de Polignac number, because 43135644243 - 2¹⁸ = 43135382099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43135644283) 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, 7189274038 + ... + 7189274043.

It is an arithmetic number, because the mean of its divisors is an integer number (14378548082).

Almost surely, 2^43135644243 is an apocalyptic number.

43135644243 is a deficient number, since it is larger than the sum of its proper divisors (14378548085).

43135644243 is a wasteful number, since it uses less digits than its factorization.

43135644243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14378548084.

The product of its digits is 414720, while the sum is 39.

It can be divided in two parts, 43135 and 644243, that added together give a triangular number (687378 = T₁₁₇₂).

The spelling of 43135644243 in words is "forty-three billion, one hundred thirty-five million, six hundred forty-four thousand, two hundred forty-three".