43135845742181 has 4 divisors (see below), whose sum is σ = 43177684584864. Its totient is φ = 43094006899500.

The previous prime is 43135845742169. The next prime is 43135845742289. The reversal of 43135845742181 is 18124754853134.

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 43135845742181 - 2³⁸ = 42860967835237 is a prime.

It is a super-2 number, since 2×43135845742181² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43135845742981) 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, 20919419795 + ... + 20919421856.

It is an arithmetic number, because the mean of its divisors is an integer number (10794421146216).

Almost surely, 2^{43135845742181} is an apocalyptic number.

It is an amenable number.

43135845742181 is a deficient number, since it is larger than the sum of its proper divisors (41838842683).

43135845742181 is a wasteful number, since it uses less digits than its factorization.

43135845742181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41838842682.

The product of its digits is 12902400, while the sum is 56.

The spelling of 43135845742181 in words is "forty-three trillion, one hundred thirty-five billion, eight hundred forty-five million, seven hundred forty-two thousand, one hundred eighty-one".