43138912091 has 16 divisors (see below), whose sum is σ = 48342083040. Its totient is φ = 38149735680.

The previous prime is 43138912087. The next prime is 43138912099. The reversal of 43138912091 is 19021983134.

It is a cyclic number.

It is not a de Polignac number, because 43138912091 - 2² = 43138912087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43138912099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3492815 + ... + 3505143.

It is an arithmetic number, because the mean of its divisors is an integer number (3021380190).

Almost surely, 2^43138912091 is an apocalyptic number.

43138912091 is a deficient number, since it is larger than the sum of its proper divisors (5203170949).

43138912091 is a wasteful number, since it uses less digits than its factorization.

43138912091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20974.

The product of its (nonzero) digits is 46656, while the sum is 41.

The spelling of 43138912091 in words is "forty-three billion, one hundred thirty-eight million, nine hundred twelve thousand, ninety-one".