43138836491 has 8 divisors (see below), whose sum is σ = 43202629104. Its totient is φ = 43075081440.

The previous prime is 43138836487. The next prime is 43138836497. The reversal of 43138836491 is 19463883134.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43138836491 - 2² = 43138836487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43138836497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2943161 + ... + 2957781.

It is an arithmetic number, because the mean of its divisors is an integer number (5400328638).

Almost surely, 2^43138836491 is an apocalyptic number.

43138836491 is a deficient number, since it is larger than the sum of its proper divisors (63792613).

43138836491 is a wasteful number, since it uses less digits than its factorization.

43138836491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18781.

The product of its digits is 1492992, while the sum is 50.

The spelling of 43138836491 in words is "forty-three billion, one hundred thirty-eight million, eight hundred thirty-six thousand, four hundred ninety-one".