43919135091 has 56 divisors (see below), whose sum is σ = 70696661360. Its totient is φ = 26946960768.

The previous prime is 43919135089. The next prime is 43919135147. The reversal of 43919135091 is 19053191934.

43919135091 is a `hidden beast` number, since 43 + 91 + 9 + 13 + 509 + 1 = 666.

43919135091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43919135091 - 2¹ = 43919135089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43919135041) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 130323675 + ... + 130324011.

Almost surely, 2^43919135091 is an apocalyptic number.

43919135091 is a deficient number, since it is larger than the sum of its proper divisors (26777526269).

43919135091 is an frugal number, since it uses more digits than its factorization.

43919135091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The spelling of 43919135091 in words is "forty-three billion, nine hundred nineteen million, one hundred thirty-five thousand, ninety-one".