43009271813 has 4 divisors (see below), whose sum is σ = 43045690668. Its totient is φ = 42972852960.

The previous prime is 43009271803. The next prime is 43009271881. The reversal of 43009271813 is 31817290034.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31817290034 = 2 ⋅15908645017.

It can be written as a sum of positive squares in 2 ways, for example, as 40720414849 + 2288856964 = 201793^2 + 47842^2 .

It is a cyclic number.

It is not a de Polignac number, because 43009271813 - 2⁶ = 43009271749 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 (43009271803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18207656 + ... + 18210017.

It is an arithmetic number, because the mean of its divisors is an integer number (10761422667).

Almost surely, 2^43009271813 is an apocalyptic number.

It is an amenable number.

43009271813 is a deficient number, since it is larger than the sum of its proper divisors (36418855).

43009271813 is a wasteful number, since it uses less digits than its factorization.

43009271813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36418854.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 43009271813 in words is "forty-three billion, nine million, two hundred seventy-one thousand, eight hundred thirteen".