9991438059 has 16 divisors (see below), whose sum is σ = 14159225600.
Its totient is φ = 6249112416.
The previous prime is 9991438031. The next prime is 9991438103. The reversal of 9991438059 is 9508341999.
It is not a de Polignac number, because 9991438059 - 220 = 9990389483 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (57).
It is a house number.
It is not an unprimeable number, because it can be changed into a prime (9991438559) 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, 845044 + ... + 856785.
It is an arithmetic number, because the mean of its divisors is an integer number (884951600).
Almost surely, 29991438059 is an apocalyptic number.
9991438059 is a deficient number, since it is larger than the sum of its proper divisors (4167787541).
9991438059 is a wasteful number, since it uses less digits than its factorization.
9991438059 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1701954.
The product of its (nonzero) digits is 3149280, while the sum is 57.
The square root of 9991438059 is about 99957.1811277209.
The cubic root of 9991438059 is about 2153.8196430418.
The spelling of 9991438059 in words is "nine billion, nine hundred ninety-one million, four hundred thirty-eight thousand, fifty-nine".