91435944438 has 24 divisors (see below), whose sum is σ = 198371572776. Its totient is φ = 30438592800.

The previous prime is 91435944437. The next prime is 91435944497. The reversal of 91435944438 is 83444953419.

91435944438 is a `hidden beast` number, since 9 + 1 + 4 + 3 + 594 + 4 + 43 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91435944433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3323868 + ... + 3351263.

It is an arithmetic number, because the mean of its divisors is an integer number (8265482199).

Almost surely, 2^91435944438 is an apocalyptic number.

91435944438 is an abundant number, since it is smaller than the sum of its proper divisors (106935628338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91435944438 is a wasteful number, since it uses less digits than its factorization.

91435944438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6675900 (or 6675897 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The spelling of 91435944438 in words is "ninety-one billion, four hundred thirty-five million, nine hundred forty-four thousand, four hundred thirty-eight".